Fat Boy Nasty Juice 50ml

Overview

The Fat Boy Nasty Juice 50ml by Nasty in Fat Boy at 0mg. Free UK delivery over £20, same-day dispatch on weekday orders before 4pm.

Nasty Juice 50ml Fat Boy at a glance

Nasty Juice 50ml Fat Boy is a 0mg shortfill e-liquid from Nasty, priced at £3.50 for a 50ml bottle. The flavour is a mango-led blend with a sharp citrus edge and a cool mint finish, and it is made for refillable vape kits rather than for disposables or sealed pods. If you already own a sub-ohm tank, a mesh-coil kit or a refillable pod device that copes with thicker liquid, this is a bottle you fill and vape on your own terms. It is sold only to adults aged 18 or over, and it is not intended for anyone who does not already use nicotine products.

Nasty is a familiar name on UK shortfill shelves, and the 50ml range in our store runs to around a dozen flavours, from fruit blends such as Trap Queen and Slow Blow to the mango, citrus and mint profile covered on this page. Every bottle in the range sits at the same £3.50 price, so the choice comes down to flavour rather than budget. You can browse the whole Nasty collection or the wider shortfill e-liquid range to see how Fat Boy sits alongside the alternatives.

The key facts, so you can judge quickly whether this bottle suits your set-up:

• Product: Nasty Juice 50ml Fat Boy shortfill e-liquid
• Price: £3.50 per bottle
• Volume: 50ml of e-liquid, normally supplied in a 60ml bottle so there is room to add a 10ml nicotine shot
• Nicotine: 0mg as supplied, with nicotine shots optional and bought separately
• Flavour: mango with citrus and a cool mint finish
• Base: listed by most UK retailers as 70/30 VG/PG, which points towards sub-ohm style devices; always confirm against the label on the bottle you receive
• Age restriction: 18+ only, with age-verified checkout

This guide is written to be honest rather than promotional. It explains what a shortfill actually is, how Fat Boy tastes and behaves, which hardware it suits, how to work out nicotine strength if you want some, what can go wrong and how it compares on price with other bottles. If you decide it is not the right match, the comparisons near the end will point you towards something that is.

How a 50ml shortfill works, and what the bottle is like

A shortfill is a bottle of e-liquid that contains no nicotine and is deliberately filled short of its full capacity. UK rules limit any bottle containing nicotine e-liquid to 10ml, and cap nicotine strength at 20mg/ml. Larger bottles are only legal to sell when they carry no nicotine, which is why a 50ml bottle like this one arrives at 0mg. The empty space left in the bottle, usually 10ml in a 60ml container, exists so that an adult vaper can add a nicotine shot at home and end up with a lower, personalised strength.

That arrangement has two practical consequences. First, you can use the bottle exactly as it comes if you do not want nicotine at all. Second, if you do want nicotine, you need to buy the shot separately and do a small amount of mixing. Neither is difficult, and the instructions further down this page walk through the whole process step by step.

On build quality, shortfill bottles in this class are made from soft, squeezable plastic with a narrow nozzle, which is what lets you fill a small tank without a funnel. The cap normally screws on over a tamper-evident ring, and the label shows the flavour name, bottle size, nicotine content and a batch reference. Look at three things when your bottle arrives:

• The tamper-evident ring on the cap should be intact before you open it for the first time.
• The label should show the Fat Boy name, the 50ml fill volume, a 0mg declaration and a batch code printed in clear, even type.
• The nozzle should sit straight and firm, because a loose or cracked nozzle is the most common cause of drips in transit and in your bag.

What you receive is the bottle alone. A nicotine shot, a tank, coils and a charger are all separate purchases, so make sure you already have compatible hardware before you order. If you are still choosing a device, the vape kits range and the replacement coils range cover the most common set-ups.

Treat the bottle as you would any consumable. Keep it upright, in a cool and dark place, with the cap on tightly. Wipe the nozzle after each fill, because sticky residue collects dust and makes the bottle unpleasant to handle. If you add a nicotine shot, write the new strength and the date on the bottle with a marker so that nobody, including you in three weeks, mistakes it for a 0mg bottle.

Fat Boy flavour profile in detail

Fat Boy is generally described as a ripe mango flavour with a citrus lift and a cool, floral mint note at the back. That description comes from the way UK retailers and independent reviewers talk about this line, and it matches the three-stage way the flavour tends to arrive when you vape it. Individual palates differ, so treat the notes below as a guide rather than a promise.

• On the inhale: sweet, ripe-tasting mango leads. It reads as a fleshy, tropical fruit rather than a sour or candy-style mango, and it carries most of the sweetness of the blend.
• On the exhale: a sharper citrus twang cuts through the sweetness. It stops the mango from becoming heavy and gives the flavour some bite, which some reviewers say makes Fat Boy a little more lively than other Nasty flavours they compared it with.
• On the finish: a cool mint note that lingers on the tongue. Descriptions vary on how strong it is, with some calling it light and others describing it as noticeably cool, so expect a moderate cooling effect rather than a full menthol blast.

Mint in a fruit blend behaves differently from a straightforward menthol. It does not produce the sharp, icy hit you would get from a dedicated menthol or ice flavour; it adds a fresh edge that makes the fruit taste cleaner and helps the flavour feel less cloying across a long session. If you want a stronger cooling effect, the menthol e-liquids and ice e-liquids collections cover that end of the spectrum in more depth.

Temperature and power change how the flavour reads. At lower wattage the mango comes through more clearly and the mint is gentler. At higher wattage the vapour runs warmer, the citrus becomes sharper and the mint tends to fade under the heat. Most vapers find a moderate setting in the middle of the coil's recommended range gives the most balanced result. Start low and nudge the power up in small steps until the sweetness and the cooling note are both audible.

Nicotine also shapes the taste. At 0mg the flavour is smooth and fruit-forward. Adding a 3mg shot brings a little more throat presence, which can make the citrus feel sharper and the mint feel cooler, though the change at that strength is modest. If you want a flavour comparison inside the same brand, the mango-led Cush Man style profile is described as a rounder, less minty alternative, and our store lists Nasty Juice 50ml Cushman Grape as a sweeter, grape-led option for people who prefer to skip the mint altogether.

One honest caution: sweet, fruit-heavy blends can cause palate fatigue if they are the only flavour you vape for weeks at a time. Many regular vapers keep two or three bottles in rotation to keep each flavour tasting fresh.

Performance and vapour delivery

A disposable is judged by its puff count. A shortfill bottle is judged by how many millilitres it supplies, how much vapour it produces in your device, and how long a bottle lasts at your usual pace. This section translates those ideas into figures you can plan around.

A 70/30 VG/PG ratio means seventy per cent vegetable glycerine and thirty per cent propylene glycol. Vegetable glycerine is the thicker component and is responsible for dense vapour, while propylene glycol is thinner and carries flavour and throat hit. A high-VG blend like Fat Boy is intended for direct-to-lung vaping on sub-ohm hardware, where a large airflow produces large clouds and a warm, soft vapour. Because the liquid is thick, it needs a coil with wide wicking channels to feed properly, which is covered in the next section.

How long will 50ml last? Consumption varies widely, but these planning figures are reasonable for sub-ohm users:

• Light use, around 2ml per day: a 50ml bottle lasts roughly 25 days.
• Moderate use, around 4ml per day: roughly 12 days.
• Heavy use, around 6ml per day: roughly 8 days.

If you add a 10ml nicotine shot, the bottle holds 60ml and each of those figures stretches by about a fifth. In capacity terms, 50ml equals roughly twenty-five of the 2ml pods that UK rules allow in a standard prefilled pod. That is why shortfills attract vapers who go through a lot of liquid: the cost per millilitre is considerably lower than in small-format products, as the value section below shows.

Flavour output depends on three things you control: the coil, the power setting and the airflow. A fresh mesh coil at a sensible wattage delivers strong, even flavour from the first puff. As the coil ages, flavour falls away gradually, and the mango and citrus notes are usually the first to dull. Open airflow gives a cooler, airier draw with more cloud, while tighter airflow concentrates the flavour but runs the vapour warmer. Because the mint note is delicate, many vapers who like Fat Boy choose a slightly tighter airflow than they would for a plain dessert or fruit juice.

Compared with a disposable vape, a refillable set-up offers more control and a lower running cost, but it asks more of you. You have to fill the tank, keep the coil fresh, charge the battery and carry spare liquid. For someone who vapes daily and does not mind that routine, the trade is usually worthwhile. For someone who wants a pocket device with nothing to maintain, a sealed pod system may feel easier. Be realistic about which camp you are in before you buy.

Coils, mesh and choosing a compatible device

Choosing the right hardware matters more with a high-VG shortfill than with almost any other kind of e-liquid. The wrong coil makes the flavour taste burnt or flat, and the wrong tank leaks. These are the points that matter.

Sub-ohm tanks. The natural home for Fat Boy is a sub-ohm tank, meaning a tank whose coils have a resistance below 1.0 ohm. Typical coils sit between 0.15 and 0.6 ohm and are rated for roughly 40 to 80 watts, though the exact range is printed on the coil. Lower resistance means more heat and more vapour at a given wattage, and a faster rate of e-liquid use.

Mesh versus round-wire coils. Mesh coils use a flat sheet of resistance material with a large surface area, which heats quickly and evenly and tends to give strong flavour with few hot spots. Round-wire coils use a wound wire around a cotton wick and are simpler, but flavour can be slightly less even. Mesh coils generally handle thick, sweet liquids well, which makes them a common choice for fruit shortfills.

Wicking. Cotton must soak up e-liquid fast enough to keep up with the heat. A high-VG liquid moves more slowly through cotton, so coils designed for it have large wicking holes. Check the coil's markings: many state a maximum VG figure, and a coil rated for 70VG or higher will keep up with a 70/30 blend without difficulty.

Refillable pod kits. Some refillable pod devices take coils in the 0.4 to 0.8 ohm range and cope well with 70/30 e-liquid, while others are built for thinner 50/50 or nic salt liquids. A pod system with a 1.0 ohm or higher coil and small wicking holes will struggle with a thick shortfill and may leak or dry out. Always read the device manual before pairing it with a 70/30 liquid.

Coil life. Expect a coil to last somewhere between one and three weeks depending on how heavily you vape, the wattage you use and how sweet the liquid is. Sweet fruit blends deposit more residue on the coil than unsweetened flavours, so a mango juice like this may call for slightly more frequent coil changes. Warning signs are a burnt or muted taste, gurgling and a rough draw.

If you need replacements, the coils collection lists heads by compatibility, and the accessories range covers cotton, spare glass and other small parts. If you are buying a device from scratch, the vape kits range is the place to compare options, and it is worth checking whether the kit is intended for direct-to-lung or mouth-to-lung use before you commit.

Battery and charging for the device you pair it with

The Fat Boy bottle contains liquid, not electronics, so there is nothing in it to charge. The battery lives in your device, and the way you look after that battery affects both safety and day-to-day convenience. A little care here goes a long way.

Refillable devices fall into two broad groups:

• Built-in battery devices. These have a sealed rechargeable cell and charge through a USB-C or micro-USB port. Capacities commonly run from about 1,000mAh in small pod kits to 3,000mAh or more in larger all-in-one sub-ohm kits.
• Removable battery mods. These take one to three external cells, most often the 18650 or 21700 format, which you charge in an external charger or in the device. They allow higher wattage and let you carry a spare battery for long days out.

Higher wattage drains a battery faster. A device running a 0.2 ohm mesh coil at 60 watts will empty a small built-in battery in a few hours of regular use, whereas a low-power pod kit may last a full day. If you plan to vape heavily, favour a device with a larger cell or removable batteries so that you are not tied to a charger.

Basic battery habits worth following:

• Use the charging cable supplied with the device, or a good-quality replacement, and a standard wall adapter rather than an unknown high-output charger.
• Do not leave a device charging unattended or overnight, and do not charge it on a soft surface such as a bed or sofa.
• Carry spare removable cells in a plastic case, never loose in a pocket with keys or coins.
• Stop using any battery with a torn wrap, a dent, swelling, or unusual heat while charging.

Disposal matters in the UK. Vape devices and loose cells should never go in household bins or kerbside recycling. Take them to a household waste recycling centre, or to a shop or supermarket battery drop-off point where one is available. Choosing a refillable set-up also helps with waste in general: single-use disposable vapes were banned from sale across Great Britain from June 2025, and a bottle of shortfill plus a reusable device produces far less discarded hardware than a drawer full of used disposables.

Nicotine strength guidance and the maths behind a nic shot

Fat Boy is supplied at 0mg. If you want nicotine in it, you add a 10ml nicotine shot, which is sold separately and is typically 18mg/ml, though some are 20mg/ml. UK rules cap nicotine e-liquid strength at 20mg/ml and bottle size at 10ml, which is why the shot comes in its own small bottle. We do not list nicotine shots on this page, so buy one from a retailer that stocks them, and check that the shot is the same VG/PG ratio as your shortfill where you can.

The arithmetic is simple. Multiply the shot volume by its strength, then divide by the final volume of liquid. These worked examples use an 18mg/ml shot:

• 0mg: use the 50ml bottle as supplied.
• About 1.6mg: add 5ml of the shot to the 50ml, giving 55ml in total. That is 90mg of nicotine in 55ml.
• 3mg: add one full 10ml shot to give 60ml in total. That is 180mg of nicotine in 60ml, which is the standard result most shortfill users aim for.
• About 5mg: add two 10ml shots, which needs a bigger bottle because the total reaches 70ml. That is 360mg of nicotine in 70ml.

If your shot is 20mg/ml, a single 10ml addition to the 50ml gives roughly 3.3mg instead of 3mg.

How do you choose? The honest answer is that it depends on your device and your habits. Sub-ohm vaping delivers a large volume of vapour per puff, which means more nicotine reaches you per puff than with a small pod at the same strength. This is why high-VG shortfills are normally used at low strengths, commonly between 0mg and 3mg, rather than at the higher figures that suit tight mouth-to-lung devices. Adults switching from smoking sometimes start at 3mg and adjust, while those who vape purely for flavour often stay at 0mg.

A few ground rules:

• Nicotine is addictive. If you do not currently smoke or vape, do not start, and use the 0mg bottle only if you are an adult who wants flavour alone.
• If you feel light-headed, nauseous or jittery after vaping, stop and wait; it is a sign the strength or the amount is too high for you.
• Do not mix nicotine salt shots into a high-VG sub-ohm liquid without checking guidance. Nic salts are designed for low-power devices, and they feel noticeably harsher at the volumes a sub-ohm kit produces.
• Keep nicotine shots, and any mixed bottle, out of reach of children and pets.

For nic salt products that suit low-power pod devices, browse the nicotine salt e-liquids. For other zero-nicotine bottles to try alongside this one, the 0mg e-liquids collection lists every strength-free option in the range.

Who Fat Boy is for, and who should skip it

No flavour or bottle fits everyone. This is a straightforward summary of the buyers who tend to get the most from this product and the ones who will be happier elsewhere.

Fat Boy suits you if:

• You are an adult smoker or existing vaper with a sub-ohm tank, a mesh-coil kit or a refillable pod device that is rated for 70/30 liquid.
• You enjoy fruit flavours that lean sweet but want some freshness at the end rather than pure candy sweetness.
• You like to control your own nicotine strength, or you want to vape at 0mg and pay low prices per millilitre.
• You vape often enough that a 50ml bottle will be used within a month, before the flavour has time to fade.
• You want a flexible, low-cost way to try a Nasty flavour before moving up to a bigger bottle.

Look elsewhere if:

• You are under 18. This product is strictly 18+ and age-verified at checkout.
• You do not use nicotine products already. Vaping is not risk-free and nicotine is addictive.
• Your device is a small mouth-to-lung pod kit with a 1.0 ohm or higher coil, which will probably struggle with a thick 70/30 liquid.
• You want a grab-and-go device with nothing to fill or charge. A prefilled pod or a refillable pod with nic salts is a better match, and the nicotine salt range will show you what is available.
• You want a heavy menthol or intense ice hit. Fat Boy has a cooling finish but the mint is moderate, so a dedicated flavour from the ice range will deliver more.
• You dislike sweet flavours or find mango cloying.

Finally, think about how you will use the bottle across a month. If you swap flavours constantly, a 50ml format is a sensible size because you are not committing to hundreds of millilitres of any one taste. If you have found a flavour you will happily vape for three months, a bigger bottle may suit you better, and the value section below compares the options fairly.

How to use Fat Boy, from first fill to refill

If you have never used a shortfill before, the process looks more elaborate than it is. Allow ten minutes for the first mix and the whole thing becomes routine after that.

Step one: decide on strength. Use the maths in the nicotine section to choose between 0mg and, if you wish, a low added strength. If you stay at 0mg you can skip straight to the filling stage.

Step two: add the shot, if using one.

• Wash and dry your hands, and work over a surface that you do not mind getting a little sticky.
• Unscrew the cap and the nozzle from the shortfill bottle. Some nozzles pull straight out; others unscrew.
• Squeeze the nicotine shot into the bottle. The 10ml of headroom is there so that the full shot fits without overflow.
• Replace the nozzle and cap tightly, then shake the bottle for at least thirty seconds so the nicotine blends evenly with the base.
• Label the bottle with the new strength and the date.

Step three: let it rest. A day of rest is optional but helpful. It lets the nicotine settle into the liquid and smooths out any harshness. Shake again before use.

Step four: prime the coil. A new coil is dry cotton and will burn if fired straight away.

• Drip a few drops of Fat Boy directly onto the exposed cotton through the wicking holes on the side of the coil head.
• Seat the coil in the tank and fill the tank, keeping the liquid below the top of the central airflow tube and away from the airflow slots.
• Wait five to ten minutes so the cotton soaks completely.
• Take a few unpowered draws without pressing the fire button, then start at the low end of the coil's wattage range.

Step five: vape and refill. Refill the tank when it drops to about a quarter full, never when it is empty, because running a coil dry is the fastest way to ruin it. Shake the bottle gently before each refill if it has been sitting for several days.

For mixing and measuring, a clean syringe or a bottle with a fine nozzle makes filling easier, and the accessories collection lists tools that help with the small tasks. Keep the bottle capped between refills, and store it upright, away from sunlight, heat and children.

Troubleshooting common problems

Most issues with shortfills come down to hardware, coil condition or how the liquid was mixed. Here are the most common symptoms and the usual causes.

• Burnt taste. Usually a dry or worn coil. Check that the tank has liquid, re-prime the coil if it is new and lower the wattage. If the taste persists, replace the coil. Sweet fruit blends such as this one can leave residue on the coil, so a darker, crusty-looking coil head is a sign to change it.
• Gurgling or spitting. Normally caused by overfilling, a poor seal on the coil or too much airflow condensation. Make sure the coil is seated properly and the tank is not filled above the maximum line. Tap the tank on a table to clear the airflow.
• Leaks. Check the tank seals, the coil seat and the fill port. Over-tightening can damage an O-ring, so tighten firmly but not excessively. A tank that leaks only after a long stretch without use may need a fresh coil.
• Flat or muted flavour. This often points to an old coil, a very low wattage or a recent switch from a stronger-tasting flavour that has left residue on your taste buds. Change the coil, increase the wattage by a few watts and rinse the tank with warm water if you swapped flavours.
• Dry hits. The wick is not getting enough liquid. High-VG liquids need coils designed for them, so confirm that the coil's maximum VG rating covers 70VG. Let the tank rest between draws if you chain vape.
• Harsh throat hit. The nicotine level is probably too high for your device, or the wattage is too high. Try a lower power or consider reducing the nicotine by diluting with a 0mg base.
• Too thin or too weak after mixing. Remember that a 10ml shot dilutes the flavour slightly, because it adds unflavoured liquid to the bottle. The change is modest at 10ml in 60ml, but it is noticeable to some palates.
• Shot will not fit. A 50ml shortfill should leave room for a full 10ml shot. If the bottle looks fuller than expected, check the label for the fill volume, and pour a little liquid into your tank first to make room before adding the shot.
• Sticky nozzle. Wipe it with a damp cloth after each refill and let it dry before closing the cap.

If a problem does not match any of the above, or you suspect a faulty or damaged bottle, contact us with your order number and a photo of the issue. Faulty items are replaced free of charge. If a coil dies sooner than you expected, remember that coil life depends heavily on the liquid, the power and the airflow, and a two-week lifespan on a sweet juice is normal.

Value for money and honest comparisons

At £3.50 for 50ml, Fat Boy costs 7p per millilitre before you add a nicotine shot. If you use around 4ml a day, that comes to roughly 28p a day, or about £8.40 for a month, plus the cost of any shots you buy. For comparison, a 10ml nicotine salt bottle at a typical price of £2.59 to £2.99 works out at roughly 26p to 30p per millilitre, around four times the cost per millilitre, although nic salts are made for different, low-power hardware, so the comparison is about cost rather than a like-for-like swap.

Within our own range, Fat Boy is priced as follows against similar bottles:

• Nasty Ballin 50ml Bloody Berry costs £2.99, which is 6p per millilitre. It is the cheaper choice from the same brand family if price is your main concern and the flavour appeals.
• Mod Mate by Nasty 50ML Mango Ice costs £3.50 for 50ml, the same as Fat Boy. If you want mango with ice, as the name says, this is the more obvious comparison.
• Hayati Pro Max E-Liquid 100ml 70/30 Triple Mango costs £6.99 for 100ml, around 7p per millilitre, so the price per millilitre is similar but you get twice the volume if you want a mango-only flavour.
• Bang 200ml Shortfill E-Liquid Mango costs £9.99 for 200ml, about 5p per millilitre. It is cheaper per millilitre and suits heavy vapers who know they will finish the bottle, but it is a larger commitment to a single flavour.
• Bar Series 100ml Shortfill E-Liquid Mango Ice costs £11.99 for 100ml, about 12p per millilitre, so it sits well above Fat Boy on price.

The fair reading of those numbers is that Fat Boy is competitively priced for a 50ml bottle but is not the cheapest per millilitre on our site. Its advantages are the manageable bottle size, which lets you try the flavour without committing to a very large bottle, and a distinctive mango-citrus-mint profile that differs from a plain mango or mango ice. If you vape heavily and have already settled on a mango flavour, a 200ml bottle will cost less over time.

Other things to weigh up:

• This product has no multibuy price. The five-for-ten offer on our site applies to nic salts, which you can find on the 5 for 10 pounds page, not to this shortfill.
• Delivery is free over £20, so six bottles at £3.50 come to £21 and qualify. Otherwise Royal Mail Tracked 24 costs £1.99.
• The shot and the hardware are extra costs that a disposable user does not face, though a refillable device pays for itself quickly if you vape daily.

You can compare more bargains on the vape deals page before you decide.

UK rules, recycling, delivery and returns

Buying e-liquid in the UK comes with a framework of rules that shape what you see on the shelf and how you use it. Knowing the basics helps you read labels and shop with confidence.

• Age. Nicotine vapes and e-liquids can only be sold to people aged 18 or over. Our checkout is age-verified, and we do not sell to anyone under 18.
• Nicotine strength. UK rules cap e-liquid strength at 20mg/ml. The same cap applied to disposables and prefilled pods before disposables were withdrawn from sale.
• Bottle size. Bottles containing nicotine are limited to 10ml, and refillable tanks and sealed pods to 2ml. That is the reason 50ml shortfills are sold at 0mg with space for a separate shot.
• Packaging. Nicotine-containing products must carry health warnings and use child-resistant, tamper-evident packaging, and you will see these on nicotine shots.
• Disposables. Single-use vapes have been banned from sale across Great Britain since June 2025. A refillable kit with a bottle of shortfill is not covered by that ban.

Recycling. Rinse empty plastic bottles and check your local council's guidance on whether bottles with residual flavour can go in the kerbside recycling; caps and nozzles are sometimes accepted and sometimes not. Batteries, devices and charging leads should go to a household waste recycling centre or a retailer or supermarket drop-off point, never into household bins. Spent coils contain small amounts of metal and cotton, so check your local centre's rules before disposing of them.

Delivery. We dispatch the same day on orders placed before 4pm Monday to Friday, and parcels go out in discreet plain packaging. Royal Mail Tracked 24 costs £1.99 and is free on orders over £20. DPD Next Working Day costs £3.99, or £2.99 on orders over £20, and is free on orders over £100. Delivery is to UK addresses.

Returns. Unopened, unsealed product can be returned within 14 days. Opened consumables cannot be returned for health and safety reasons, which is standard across the industry. Faulty or damaged items are replaced free of charge, so contact us with your order number if anything arrives wrong. Every product we sell is sourced from trusted UK distributors and is genuine stock.

Fat Boy is one of around a dozen flavours in the Nasty 50ml range. If you want to compare it with the rest, take a look at Slow Blow, Trap Queen and Wicked Haze, or browse everything from the brand on the Nasty collection page.