"Clappin" is the act of having sexual relations with another person. This Word was originally used by metalheads from Berkeley California. See O.G. Bootyclap
Can refer to someone being killed or can refer to someone having nasty hardcore sex thus making a hard thumping noise which can resemble someone clapping their hands.
Liz wants to clap Gerarld's apples tonight at the party! Can't wait! Liz is totally gonna be clappin apples.
By Shantee
Ball Clappin'
When two guys have sex with eachother by use of a dildo in each one, bent over, back to back, so that the force of them having sex will cause their scrotum's two swing against eachother, making a clapping sound.