A phrase some men feel the need to shout when recieving a lap dance.
"Do you like that, sexy?"
"Booty do your duty!"
Aside from the popular definition, this word can also be used to describe something that is a crappy (or sh!tty) situation, hence "booty(where it comes out) doo(what comes out).
"Man that teacher is wack. She gave us way too much work."
"I know man! This is some bootydoo!"