When someone with a tiny penis "try's" to masturbate. Their peter is so tiny that they end up just slapping their sack
Jessica: I caught Perry beating off in the bathroom yesterday.
Amanda: Trust me, his dick is so small he was just slapping the sack.
Amanda: Trust me, his dick is so small he was just slapping the sack.
by Jameshasahugecock May 13, 2018
Get the slapping the sack mug.Bob: ur mum gay
Jim: ur dad lesbian
Bob: ur granny a tranny
Jim: ur ball sack a small cap
Bob: *dies of cardiac arrest*
Jim: ur dad lesbian
Bob: ur granny a tranny
Jim: ur ball sack a small cap
Bob: *dies of cardiac arrest*
by Saltysaltysaltysalt February 2, 2019
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