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When someone gets flames coming off their butt due to:
1. Eating an extremely hot curry
2. Having un-lubed anal sex
3. Someone has put a flammable substance on your butt and your ass begins burning and blisters your butthole
"That curry was so hot, when i crapped it created a buttfire. My goddamn ring is blistered."

"Your such an idiot, why didn't you use lube?! Now your buttfire has melted the condom to my cock and your butthole."

"Haha, yeah we made a buttfire on Paul, it was cold last night."
by Cheesynerd October 10, 2008
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when you strike a match in front of yo girlfriends ass and she farts
"My bitch started a buttfire"
by lostmytoesinthewar August 20, 2018
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