When two dudes' nut sacks slap when they are double penetrating your mom.
bitch: Wow boys you're really pounding me hard, I can hear your sacks claping!
by the clapper October 23, 2003
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The claping sound your scrodem makes when snaped back and forth in a rapid motion.
my sac claped when i was having sex.
by aldsjaflkjds August 11, 2006
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the act of making a clapping noise with your sac. This can be done when having sex or solo. Solo being the real dick trick when alone swing back in forth to make the sac clap against the gooch.
Connor: Hey, Sally check out my new dick trick.

Sally: Wow thats a sac clap
by Braydy January 24, 2012
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when a person's nut sac smacks next to his crotch when moving in a fast passe.
I made nut sac clap.
by flambck April 3, 2009
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