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1.
The action of pelvic thrusting to create a slapping noise erupting from the gooch to testicles contact. Slappin' your weiner up and down to make slappy noises.
Dude, did you hear that ballswack? It was intense. It sounded like two sea lions mating.
by Drummingbagel December 05, 2009
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Words related to Ballswack:

ball balls ballsack sack swack testicle testicles