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The burning sensation that occurs after one has taken an epic diarrhea.
Dude 1: Why are you walking so slow? It looks like you got raped.

Dude 2: this butt burn is killing me!
by The hempn January 31, 2010
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When you have taken to consecutive poops in a short amount of time and your butt burns.
Man, I just got out of the bathroom again, I have buttburn.
by Squigglespp March 06, 2015
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After pooping and wiping your butt so often because of diarrhea, your butt crack chafes and hurts.
"Dude, I feel like crap as it is and NOW I have butt burn."
"That sucks."
by firecheeks October 31, 2009
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