When a girl (most likely an underaged teenage girl on a social networking site) takes a picture in the bathroom mirror, with her back to the mirror, and her butt seated on the sink, amplifying the rotundness of her butt. Often used to deceive potential men who would pursue sexual relations with her.
David: Broo! did you see that picture Kayla put up as her profile? I never noticed her ass looked that big before!
Brian: dude, it's not.. it's a classic case of sink booty.
A person who acts like an ass then gets butt hurt and blames other people for their problems. An overly sensitive hypocrite
Khodee freaked on Shamar, Shamar madeout with Mike, and Mike sucked off Khodee then they all cried for cheating on each other. They’re all stinky bootyholes!