To make ones butt cheaks clap together. It's a new phenomena which can mostly only be done by a chick wit a big ass. It's accomplished by abruptly bouncin dat ass but, like I said it's almost impossible unless you got a whole lotta ass.
You shoulda seen this one stripper at the club. She could make it clap!
an action wich usually happens during the act of intercorse. the clap is caused by the mans pelvis rapidly contacting the butox of their partner in such a way that it causes a claping sound.