another joke you play on your friends (usually guys). see example.
me: what do you do before you go to bed?
him: ???
me: hit the sack! *punch in the nuts*
by fanatacist July 24, 2004
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Act of male masturbation, can only be performed by circumsized men. Where the masturbation becomes so vigorous and violent that the hand actually hits the testicles while stroking the shaft.
I went to sleep and woke up and my friend Billy was "hitting the sack" next to me wearing nothing but a lamp shade over his head.
by greendayrulz7 March 11, 2010
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1. The act of getting into bed for the purpose of sleep.
2. The act of masturbating.
by Dimpitidoopie January 11, 2008
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A term used to tell a person to do something or leave a certain place. This term was first developed when a super scientist changed the channel, which his grandson was watching, on the television.
Son: Hey! I'm watching TV!
Grandfather: Hit The Sack Jack!

Son: I don't know if i should ask her out Rick.
Grandfather: Hit The Sack Jack!
by Mattanian May 30, 2017
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A declaration used in parting from company when one is about to retire for the evening to sleep, but not before masturbating.

In delivery, there should be a slight pause between "sack" and "and" to emphasize that what was implied by the first statement was not what was actually intended.
Me: Well, guys... I oughta be getting along. Time to hit the sack... and then... go to bed.

My Company: (moment of dawning... laughs and jeers)
by J Monty Rivers December 27, 2003
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