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?
-Football Player: Wow, dude! Ur jacked as shit!
-Soccer Player: I know, right?
by mtnt69 May 08, 2011

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.
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!
Man, Theo pissed me off so bad-- I'm gonna jack his shit up yo!
by Wikiwonder July 09, 2009

to steal someone else's goods, take a five-finger discount, or otherwise rob someone of their possessions.
by the_rotten1 December 28, 2011

by Jessica Grimes January 07, 2005

by Sterv A. Hamitlton February 28, 2009

Friend: Aye bro what u doing in the bathroom
You: I'm doing a "jack 'n shit"
Friend: better use a Kleenex
You: I'm doing a "jack 'n shit"
Friend: better use a Kleenex
by Barkeisha January 02, 2017

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.
It's worth jack shit. / It isn't worth jack shit.
I didn't get jack shit. / I got jack shit.
by cazort June 07, 2005
