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1.
To masturbate at such a high speed that your hand smacks your scrotum and makes a wet smacking noise.
Yea, I used to smack the sack, but then it got to loud and my parents heard.
by The Guy1 412435235235 January 10, 2009

Words related to Smack the Sack

dick jerk-off masturbate sack smack spank