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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.
by jorman1 April 04, 2011