It means to steal. More specifically it means to steal something that others covet or gives one maximum pleaure. Examples: Ladies, beer, money, drugs etc... Derived from swindle, snag, hack.
Chu betta swack that shit mutha fucka! Aye' lemme swack a brewski.
by Triple Triple C-Naj August 29, 2008
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Sweaty sack. Testicles with little or no ventilation will result in swack.
This humidity is really giving me swack.

Lick my swack.
by Corey March 24, 2003
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swack is a type of hit. it is achieved my placing one's hand in the position used to smack oneself in the chest in the "retard" style. instead of hitting your own chest though, you swing your arm out and hit other people as if the hand was a crude whip, then quickly draw your hand back.

This definition was made in 2001, when tw o floridian boys were bored and began hitting each other in the swack style. They soon named the hitting form, swacking.
"Kevin and Chris are always swacking me; they're pretty good at it."
by Nestor R. Abreu January 20, 2005
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when your nutsack is sweaty
Matt said the gym coach worked him so hard that he had a bad case of swack.Can also be used as "swits" or "swass"
by Tboy99 May 16, 2005
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swag-jacking
to steal/jack one's swag and attempt to make it your own.
Pauly D: Wake up! Yeah Boi! Cabs are here!!

Ron: Wake up! Yeah Boi! Cabs are here!!

Mike: bro, Ron is swacking you.

Pauly D: I know man, wtf?
by mightygiggle September 17, 2011
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