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6.
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
by Thepersonwhowillnotbenamed May 04, 2012
 
1.
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.
by Smackdown Lane June 19, 2006
 
2.
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.
by LisaHero November 10, 2007
 
3.
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!
by Emmett T March 02, 2010
 
4.
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.
by Jake the Ripper November 18, 2007
 
5.
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."
by TheTurdBurglar December 28, 2013
 
7.
That fucked up half-choke/snicker sound you let out when you took too big of a hit, but then hang onto it...
Back Fire is the action like in Up in Smoke, when Cheech hits the Maui Wowie Labrador joint, and Chong tells him "Toke it up! Toke it up man!"
by christy.skywalkera November 10, 2011