DC slang for a small butt. It means the butt snaps when it shakes. Not much meat on the butt cheeks.
Person A: I got them clappas!!
Person B: No you don't those are snappas!
Person 1: I wish I had clappas. I don't get much love with these snappas.
Person 2: Eat cornbread. They say that makes your butt big.