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The backhanding of a man's genatalia causing extreme pain and can cause him to fall down and cry like a 6 year old girl.

A sac whack can be performed mid way through a conversation to maximise laughter and unexpected pain.
Eg:

Bob: "Hey man wanna go down to Smoky Jim's and get a bur-"
Steve: "SAC WHACK!" *backhands bob in groin*
by Dick Cheese June 24, 2005
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Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
via giphy
by ecogoth December 30, 2020
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