"Half Jack" refers to a person who is gender confused, and possibly considering sex change surgery. A person who either feels that they are of the wrong gender, or that they are half male and half female.

Mary was really into Tom at the party last night, but she wasnt aware that he's "Half Jack" and had no interest in her.

half jack by Scott the Heirophant February 9, 2008

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Double Jack

Either during sex at orgasm or while your 'one night stand' is asleep.
the idea is you cum and shit all over your partner at the same time giving you and your partner your weird sexual jollys. if your partner is asleep then you do the same process without waking her up and leave her alone in her house/flat, so she wakes up with shit and cum all over her body, make sure you give her a fake name so she cant track you down.

Ex1 - dude i was banging this chick lastnight and she asked me to double jack all over her face!

Ex2 - hey i had this one night stand lastnight and when she was asleep i doublejacked all over her body and i went back home!

Double Jack by Reiss "The Sex" Jones May 5, 2008

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New Jack

Term used to define a new Corrections Officer, usually a rookie.

Yo that dude is a new jack, he don't know shizat.

New Jack by thedarm May 7, 2008

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Dirty Jack

When your dog named Jack looses all his teeth because he has rotten mouth.

Dirty Jack bit at that little girl. It didn’t hurt her because he doesn’t have teeth!

Dirty Jack by Picky Nicky November 23, 2019

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