Backfire 

to bring a result opposite to that which was planned or expected.

They never learn even after all the games they play continue to backfire on them.

Backfire by Goddess12* December 22, 2013

backfire 

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."

backfire by TheTurdBurglar December 28, 2013

backfire 

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.

backfire by Smackdown Lane June 27, 2006

Backfire 

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!

Backfire by Emmett T March 2, 2010

Backfire 

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

Backfire by Thepersonwhowillnotbenamed November 5, 2012

Backfire 

The prefix given to an internet thread predicting the future that fails miserably, causing lulz.

PackedLunch's thread just got a Backfire tag

Backfire by MorganAshlee February 28, 2015

Backfire 

When the intended consequence of a corrupt plan to set someone up does not go as planned, and instead you are exposed with concrete evidence of your misdoings.

" They stalked, harassed and even spied on him but their plan backfired because they dropped their camera running off the property they illegally trespassed on and he was able to prove the harassment finally."

Backfire by ParentalAlienationIsAbuse August 14, 2017