When a girl is licking your ass and you slide out a small amount of poo.
When Roxy was licking my ass the other night I couldn't resist to squeeze a little one out.

I ended up doing a backfire on her tongue.
by Mazzbot January 16, 2012
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a belch or burp
My friends an I have a backfired fart contest to see who can break the record for the longest and loudest backfired fart recorded in history.
by minnie555 January 26, 2010
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Refers to da often-moderately-painful experience dat follows an especially "heavy-duty" cough, burp, sneeze, etc. --- a small amount of stomach-acid will travel upwards into the throat and create an acrid burning sensation.
Shortly after consuming a large meal is one of the most notorious times for a bronchial backfire to occur; it's wise to have a large glass of water or milk handy to hastily swig from in case of mishaps like this.
by QuacksO June 13, 2019
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Slang: When a well-laid plan blows up in your own face
Joe Biden and the Democrats hiring 87,000 IRS Tax Law Enforcement Agents is going to backfire, once the 3949-A Information Referral Forms for Warren Buffett and Larry Fink are investigated for Public and Political Corruption.
by FieroGT80 May 2, 2023
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When extra gas accumulates in your tail pipe and the heat ignites it causing a small explosion resulting in snaps, crackles, pops, and sometimes flames.
"Dude it's backfiring!
"mY sUpRa BaCkFiReS sO iT mAkEs 800 hOrSePoWeR."
by Gapplebees June 13, 2023
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Returning back to the originator of an action with an undesired effect.
Plenty of us overpay on loans to dig out of debt faster—but it can backfire.
by Toa Pohatu May 27, 2017
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When a man is fucking a girl and busts a nut in her and It shoots back out all over the man
I was fucking my girl then she backfired all over me.
by Fear oh May 20, 2016
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