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When your feces is so watered-down that excreting it is similar to urinating out your anus. Generally the result of food poisoning, stomach flu, or using way too much lube for anal.
"After eating the nasty Vietnamese food, she was buttpeeing for days."
buttpee by seemo March 23, 2007
Related Words

buttweenis 

'weenis' is the extra skin on your elbow
'butt' is your gluteus maximus, or for you idiots it's the ass
therefore when combined it is the extra skin on someones glutues maximus.
usually used when insulting someone or just complimenting them.
"you're a fuckin buttweenis!" or "wutssup buttweenis?"
buttweenis by Paloma M. November 20, 2006

buttpenis 

The unfortunate growth of a sex organ originating from inside the rectum and protruding through the anus.
Eww, dude, you have a fuckin' buttpenis. That's nasty.

buttpeepoo 

It is a combination of a butt, pee , and poo.
"All you have to do is memorize the secret magic word Buttpeepoo"
buttpeepoo by nerdygurl222 November 23, 2016

buttweenie 

the area between your butt and your weenie
my buttweenie smells like cheese
buttweenie by taintaclaus September 25, 2009
(Verb)
To Masturbate

My brother buttpees by swiping his dick
My brother buttpees by swiping his dick
Buttpee by Buttpeeing April 3, 2019