Top Definition
When you're about to fart, and something extra (and usually liquid) explodes out of the ass.
I was going to light my fart on fire at the party, but a few seconds later everyone got hit by my backfire.
af Smackdown Lane 19. juni 2006
17 more definitions
When a guy cums so hard, he ejaculates into his own face.
Dudes, I hella thought she was going to swallow, but she totes made me backfire.
af LisaHero 10. november 2007
When a man is receiving a blowjob and upon finishing inside the mouth of the giver, the contents are spat back in his direction.
Last night my girlfriend backfired all over my chest!
af Emmett T 2. marts 2010
The moment where, when you're taking a shit, a large pocket of gas (referred to as a future-fart) that was resting mid-shit or between two shits escapes as you're passing your lovelog, resulting in a sudden violent fart than not only propels your previously freefalling turd at Mach 2 speeds, but also results in a pleasing shotgun blast of turdlings across the toilet bowl.

A backfire is so named for it's similarity to a car backfiring.
"Man, I was taking a dump and backfired, and now I get 'Nam flashbacks when I visit the shitter."
af TheTurdBurglar 28. december 2013
when a guy cums hard enough to blow his load into his own face.
I thought she was going to finish the job, but she pulled off early, and I backfired.
af Jake the Ripper 18. november 2007
After a really serious depressing prediction about the future of an old pensioners death the definition is when the old pensioner makes a funny remark which ruins the seriousness and brings the convocation back to normal levels.
Psychic: you will burn in the fiery pits of hell for the rest of eternity....

...

Pensioner: I'm not boiling in no freaking coldron

Psychic: well that was a backfire
When a guy receives a blowjob and cums so hard it hits him in his face.
Dude, I was getting this wicked BJ and I thought she was going to swallow, but she made me backfire.
af suchalamerequirement 4. november 2007

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