1. To have nothing.

2. In texas holdem hole cards consisting of jack two of anything.
Ie: I have jack shit for money.

I had to fold when I caught jack shit.
by phoenix 1997 July 11, 2010
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This term is used to describe someone who thinks they know everything yet are often wrong. They will argue and lie to be right. Often get louder when challenged. It can also be said they have shit for brains. Often offer unnecessary information just to have something to say.
Said to someone who is the offender."You know Jack shit about everything shit for brains".
by Lordsmith October 26, 2010
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Poker term:

1) Traditionally refers to drawing Jack-Deuce as your starting hand, ie. "Jack-Shit"; a bad hand. Although may sometimes be extended to refer to a combination of a Jack with any low value card 2-7, typically.

2) Jack-Shit Poker - A variation on the familiar Seven-Deuce Hold'em. A pre-arranged additional reward is owed by one's opponents if he wins a hand with Jack-Deuce as his hole cards.
Player X: You had a straight?

Player Y: Nah, I had Jack Shit!
by Chuck_1804 September 24, 2010
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Term used to describe the act of spanking the monkey while taking a dump.
I got really bored yesterday, so I did a Jack Shit in the bathroom
by the dirty liberal November 28, 2009
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When you is Jack and you pour hydrofluoric acid down your toilet to fix a clog and shit comes spraying back up in your face giving you acid burns that need medical attention.
Bob didn’t know jack shit could happen until he woke up the next day in the hospital smelling like burnt crap.
by Buttersrules February 5, 2021
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1. jack rabbit feces.

2. something plentiful and omnipresent, yet nonetheless worthless.

3. nothing, or nothingness
(see jack squat)
"This here jack shit ain't worth jack shit."

Incorrect: "He don't know jack shit."
Correct: "He knows jack shit."
by Joe Bone March 11, 2005
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