Its a game involving a wooden paddle or your hand and someones testicles. The object of the game is to see how hard you can wack someones balls until they turn red each time you wack the sack you get points. This game originated from the website ebaumsworld.
1.Today me and my brother played wack the sack. !!!!Now My balls really hurt!!!!
2. I really love playing wack the sack with my boyfriend.
by Wack the sack. August 29, 2008
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a large amount. A collective noun of more than the usual or normal quantity
The Duggars have a wack sack of kids.
by shareski November 13, 2011
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When a drug dealer either sells someone less of a drug that they paid for or passes off another substance as the drug someone is buying.
I bought an eighth of weed but the bag was missing almost a gram, the bastard sold me a wack sack.

I bought a gram of coke but it was just baking soda, i was tricked with a wack sack.
by MistahBradshaw August 31, 2010
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Masterbating to get yourself tired when you have difficulty going To sleep at night.
I wack out and sack out.
by Tommy Bunz 69 March 14, 2022
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