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1.
(v) verb
Definition: When someone farts and produces a clapping sound from his or her butt. Also can be used when someone is on the toilet and makes the same sound.
Wow John, your farting sounded like a clap! It's a butt clap!
by Monyrith March 05, 2006
 
2.
The noise the ass-cheeks make when doing anal sex.
"When Ronny shoved the tube in, Steves buttclap was louder than ever."
by Timoteo Becerra August 01, 2006
 
3.
This is when you have gonorrhea in your ass.
She can only give you butt clap with her strap-on if she licks it first!
by Moose Hole March 24, 2009