The act of male testicles slapping their partners ass during sex. The best way to determine the "core"ness of sex is by how hard the males testicles are slapping their partners ass.
Main Entry: Ball Slapp·ing
Function: Adjective
Etymology: American Slang
1: Loud slapping sound created during intense sexual intercourse as the balls bang against a lovers body.
My girlfriend and I had ball slapping sex last night, all night.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."