A form of Improvised Weapon whereupon one fills their mouth with liquor, holds up a torch, candle, or if they're really ballsy, match, and spits the alcohol out into it, blasting out a stream of flame.
Possible in Real Life, but only with very high proof alcohol (at least 100 proof, or 50% ABV). Anything lower will sputter a bit, if not put out the flame. Beer and wine aren't going to do it; you'll need to use something distilled. You'll need a good strong whiskey, some fierce vodka, 151-proof rum, absinthe, moonshine, or while not really what one would consider booze, PGA. That's right, pure grain alcohol — 100% ethanol. For things that aren't technically booze, there's methanol, industrial alcohol or wood spirit. Do not drink this stuff! (And for methanol and alcohol fuels based on it, don't even put it in your mouth for this stunt, the tissues of the mouth absorb!) Do not breathe it in! Do not get it on your skin! It is nasty! There is also isopropyl, commonly called rubbing alcohol. It is expensive and definitely not for drinking, but it burns nicely. Obviously, this is a hazardous stunt best left to practiced performers.
Sister Trope to Aerosol Flamethrower. A more distant cousin, with more Toilet Humor but only slightly less realistic, is the idea of harnessing a concentrated source of methane into a weapon of Fartillery.
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Anime And Manga
In the Eat-Man manga, Bolt Crank has the ability to swallow anything and later eject it through his hand. So once he swallowed some industrial alcohol ("200 Proof"), and...
Bruce does this in the first episode of Mai-Otome 0~S.ifr~, pretending to be drunk and stumbling into the train car where the titular Sifr is being held, only to unleash this when they trick to kick him out.
Renkotsu of the Shicinintai uses this trick in InuYasha.
This is how Horny the Clown is beaten in the Slasher MovieDrive Thru; the Final Girl spits out alcohol she had in her mouth when he shoves lit birthday candles near her face, causing him to catch on fire.
This is how the Alpha Betas lost their fraternity house in Revenge of the Nerds. One guy playing around with a mouthful of Everclear & a match set the house ablaze, so the Alphas take over the freshman dorms, forcing the nerds out.
The fire eater from the circus in The Warrior's Way does this, using it to light the candles on a birthday cake. It becomes a Chekhov's Skill when he later uses it to light a couple of the Colonel's henchmen on fire.
Jolly Roger kills a man this way (using a Finger Snap Lighter for the needed flame) in Jolly Roger: Massacre at Cutter's Cove.
Featured in the spectacular opening of Santa's Slay, when Santa sets a woman's hair on fire.
In Pitch Black, one of the protagonists is caught in the dark with a guttering torch and a bottle of expensive spirits. He takes a big swig and blows a huge fireball, illuminating the hundreds of dark-loving beasties surrounding him just before the torch goes out and... crunch crunch crunch...
In The Rum Diary, this is done to display the potency of Moberg's moonshine. Kemp later does it to ward off angry Puerto Ricans he stiffed, only to end up setting fire to a cop's mustache.
Gangster boss Rory Breaker does this in Lock, Stock & Two Smoking Barrels. Take Barfly Jack's quote: "Rory gobs out a mouthful of booze covering fatty; he then flicks a flaming match into his bird's nest and the man's lit up like a leaky gas pipe."
In the Discworld book Feet of Clay, Nobby Nobbs does this by accident when a Spit Take after a glass of very, very, very strong brandy combines with a lit cigar. He seizes the opportunity to run as fast as he can, though.
A human warrior once did this in Daughter of the Drow (Starlight and Shadows trilogy) — not for damage, but to disable an opponent with infravision.
This is how Gene Simmons of Kiss does his famous fire-breathing stunt.
The drunken master monk prestige class from Dungeons & Dragons can preform this feat with alcohol that they have already swallowed when they are drunk enough.
In Dishonored members of the Bottle Street Gang fight this way using whiskey they distill in their brewery. In their areas you can also find bottles lying around in various nooks and crannies that, if thrown, explode. If it's the same stuff in the bottles as in their breath attack, then breathing it out as fire seems a lot safer than actually drinking it.
Pandaren Brewmasters in Warcraft III have both a "throw booze" and "spit fire" abilities, which can be combined.
And now, with the Mists of Pandaria expansion for World of Warcraft, Monks with the Brewmaster spec will have this ability. Extra damage is done to enemies already soaked in booze by the other Brewmaster attacks as it ignites them for Damage over Time.
Auron does a variant for Tornado, one of his Overdrives in Final Fantasy X. What he does is create a huge whirlwind, then throws his whole bottle of sake into it, and the whole thing bursts into flame. Through friction, maybe?
In Sanitarium the main character is taught how to do this by a carnival fire-eater, which is then used to fight a Puzzle Boss.
King of the Hill: Pictured above, Monsignor Martinez does this with communion wine. As pointed out in the page description, this should not be a strong enough alcohol to produce the effect, but oh well.
Cotton does this with sake in one of his war stories.
This happens in Rango even though there is no liquor (cactus juice) and no flame (though he did swallow a lit cigar beforehand).
Pickles from The Oblongs did this, only she just used a lighter and her alcohol-soaked breath. She tells Bob that she's good for welding, but she's too drunk to drive.
In a typical shoot-out with the Russian KGB in Archer, Lana and Archer only have blanks in their guns so have to make these.
Still a popular performance art today, with carnival fire-eaters, or fire dancers like Patika Starr.
Performers are more likely to use kerosene or lamp oil, though, for two reasons: one, because alcohol burns with a pale blue flame that's almost invisible in daylight, and two, because you don't have to swallow alcohol to absorb it into your system - it will be absorbed through the tongue, cheek, and gums. One Booze Flamethrower isn't enough to put you over the drunk-driving limit, but repeated performances will make you intoxicated.
A slightly disturbing part of this is that, no matter how good a fire-breather or fire-eater you are, you will end up swallowing some of the flammable liquid, particularly if you tip your head back, which is actually required for some of the most impressive displays like "Dragon's Breath". As a consequence, people who regularly perform fire-breathing and fire-eating routines often suffer health problems, and have to take time off from fire-breathing to let their digestive and respiratory systems recover from the damage done. Performers try to have at least one other performance skill - for instance juggling - so that they can continue to earn during these biologically-enforced fallow periods.
Always use ethanol (or the aforementioned kerosene or lamp oil) instead of methanol if you're going to try fire breathing. Despite having similar taste and short term effects to ethanol (drinking alcohol) methanol poisoning has caused a lot of people to either go blind or die. If you use methanol in this stunt and it's in your mouth at any point, you are Too Dumb to Live.
Some enterprising militias and paramilitaries use booze as flamethrower fuel, because they can get it more readily than petrochemicals.
Not really such a hot idea in real life, because traditional fuels like gasoline are not only significantly cheaper than the concentrated alcohols that could work with a flamethrower, but it also burns better.