The act of pissing in someone's butt, usually done by a man due to the females' inability to aim properly, or
Someone who is a douche
J: You wanna go hang out with Will?
T: Na man, he's a butt pisser.
J: Yea, I forgot about that. He's probably with that queer dude.
A term used to describe a person that likes to use the phrase "I'd so pee in her butt" as a way of saying that a woman is attractive.
VO: "Wanna play some video games?"
Howitzer8: "Nah I'm watching TV. Dude I'd so piss in her butt!"
VO: "DUDE, you're a freakin butt pisser!"