Any action in which, during sexual intercourse, the male genitalia hits any part of the female's body. Most common while having sex doggy-style when the male's testicles are hanging loose and they slap the female's pubes during thrusting
Man, that pornstar's balls are hung and he's banging the chick doggystyle! Check out the sacksmacking dude!!
by hanginghorse87 August 20, 2010

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