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1.
In a pornographic film, or in real life, when the male's scrotum is long and loose, and is riding a female hard, the balls will slap against the female's body, created an additional slapping noise, hence, the bonus ball slap.
Listen to that bonus ball slap.
by sir poopiepants March 20, 2006

Words related to bonus ball slap

ball bonus scrotum slap testicles