1. An expression using the verb jack, which means "to steal." To "jack that shit" is to "steal that thing or those things."

2. To "jack someone's shit" can also mean to punch them or beat them up.
As soon as that fool gets up and walks away from the moneybag, I'm going to jack that shit.

Man, Theo pissed me off so bad-- I'm gonna jack his shit up yo!
by Wikiwonder July 9, 2009
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When a person thinks that they are really strong with enormous muscles, but in reality they are small.
-Soccer Player: Hey bra, I just maxed out at 140 on bench!

-Football Player: Wow, dude! Ur jacked as shit!

-Soccer Player: I know, right?
by mtnt69 April 18, 2011
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to steal someone else's goods, take a five-finger discount, or otherwise rob someone of their possessions.
If you don't pay back the money you owe, I'm going to jack your shit!
by the_rotten1 December 26, 2011
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say i just took someone's id they had in their hand:

Me: I just jack dat shit.
by Sterv A. Hamitlton September 30, 2008
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When u masterbate while taking a crap

Aimed towards boys
Friend: Aye bro what u doing in the bathroom
You: I'm doing a "jack 'n shit"
Friend: better use a Kleenex
by Barkeisha December 27, 2016
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Nothing, or something equivalent to nothing. Jack shit has the remarkable property that its absence and presence are identical. Typically used with or without a negative to describe a total lack of knowledge, value, or significance. Its use carries a strong negative connotation which can express frustration, disdain, ignorance, or other negative qualities.
I don't know jack shit about that. / I know jack shit about that.
It's worth jack shit. / It isn't worth jack shit.
I didn't get jack shit. / I got jack shit.
by cazort June 2, 2005
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