diarrhia or the most liquidy sort.
i hate the acrid smell of butt piss
by minghi April 26, 2003
1. Literally expelling urine from one's ass after having the urine injected into the anus during the act of a pistol star.
2. A specific type of diarrhea, wherein the contents of one's ass is expelled in a liquified, piss-like manner.
Paul was buttpissing all night after the girls all gave him a good pistol star.

Grant had to seriously buttpiss the morning after Joey gave him a pistol star for his birthday.
by Lovely_Lolita August 31, 2013
Diarrhea, or liquid shit that comes out of your ass. Sometimes occurs when eating Mexican food, eggs, or drinking too much whole milk. Akin to shitting a lot of Yoo-Hoo.
Holy fuckin shit dude, your mom's egg casserole gave me some SERIOUS buttpiss!!
by bobbydone November 23, 2006
when stools exit the body in a highly liquified, and often projectile, state. AKA Diarhea...coined by BirminghamStang of a popular V6 Mustang site
I at a big burrito and the buttpiss was horrendus....
by Chris Strickland November 23, 2006

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