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blowback 

the substance that splashes back onto your ass when you take an explosive shit.
dude, that shit had some serious blowback!
blowback by shizzlebear September 30, 2005

blowback 

1. The expulsion of anal pear and accompanying detritus during gargantuan anal orgasm.
"Walt screamed in horror and ecstacy as his anus erupted in orgasm. Without warning, the nose cone-shaped dildo exploded into the air and struck Juanita directly in her left eye, horribly blinding it forever. It was another tragic case of blowback."

blowback 

When you have to hold in a fart due to being in a public or enclosed space (airplane, subway, car) and the fart rumbles back up into your plumbing. Over the course of several hours, a serious queue of un-expelled farts will build up, prompting an extended cropdusting at the earliest convenience.
Joey: Dude, that 8hour flight from Frankfurt was murder. I musta had about 40 blowbacks.

Chandler: Ouch. How'd you eventually clear the backlog?

Joey: I waited till there was nobody behind me on the slidewalk, and did about 300 feet of cropdusting!
blowback by TheRob September 27, 2007

blowback 

When your cumshot hits your own face.
I was fucking this girl and when she pulled out my dick to finish me off she aimed it the wrong way and gave me a blowback.
blowback by DMITCH November 22, 2007

Blowback 

It is when someone (more than likely a male), takes it in the butt and whoever is on the giving end deposits some semen. the "blow back" occurs when the receipient farts it back out on to the "giver". Hence the term "Blow Back"
I was with my "life partner" going hot and heavy and decided to leave him a gift, he decided to take my "gift" and Blowback on me.
Blowback by Arrogant Carroll May 17, 2013

BlowBack 

The end result of gassy crap on the back of a toilet bowl.
For example, you go out and eat mexican food chasing it down with the few beers. You wake up the next morning and go to bathroom. The gassy build blows crap on the back part of the toilet bowl called BlowBack.
BlowBack by midas360 June 11, 2008