Define Shit Jack Meaning

The action of a male jacking off while taking a shit.

The act of shitting in one's hand, and then masturbating with it. (The lonely mans gay sex)

F*ked up beyond all recognition...
Totally messed up and looks like shit.

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.

Jack is the only son of Awe Schitt and O. Schitt. Awe Schitt, the fertilizer magnate, married O. Schitt, the owner of
Knee-deep Schitt, Inc.
Jack Schitt married Noe Schitt and they had 6 children: Holie Schitt, The twins; Deep Schitt and Dip Schitt, Fulla Schitt, Giva Schitt and Bull Schitt.
Jack and Noe divorced. Noe later married Mr. Sherlock and because her kids were living with them, she wanted to keep her previous name. She was known as Noe Schitt-Sherlock.
Dip Schitt married Loda Schitt and they had Chicken Schitt. Fulla Schitt and Giva Schitt married the Happens
brothers in a dual ceremony.
The Schitt-Happens children are Dawg, Byrd and Horse. Bull Schitt left home to tour the world. He recently returned with his new bride, Pisa Schitt.

Now, when someone say's you don't know Jack Schitt, you can correct them.

A term used to describe a lack of anything.

An American gentleman, with whom certain people are unfamiliar.

nothing,ziltch,zero,empty,contains absolutely nothing.

1) A term most commonly used for when people describe that they don't know, or have not done anything.

2) Probably the name of some guy somewhere, who i'd -really- like to meet.

having absolutly nothing.