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."
(Verb)
To Masturbate
My brother buttpees by swiping his dick
My brother buttpees by swiping his dick
When your handed a cat and it pops it's anal gland all over you and the anal gland juice gets all over your hand. The gross, brown substance smells like smells like BO, cat urine, and human ass.
"Why am I all wet and why does it stink?"
"Oh the cat buttpeed"
"Oh no it smells like a mixture of body odor, cat urine, and human ass."