When you live in an on campus apartment and your "booty call" lives through your wall, he or she becomes a "booty knock". Because when you need some booty, you simply knock on the wall, because his or her room is on the other side.
Friend 1: "wow, i want some booty." (knocks on wall)
Then, the booty knock shows up knocking on the door.
Then, the booty knock shows up knocking on the door.
by jorman1 April 05, 2011