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A boy that humps other boys on a regular basis. Jack also rapes Cats, Dogs and other household pets.
Jack by spacelime June 13, 2017
Wow so many girls like him he must be a jack
Jack by Godisdogspeltbackwards August 11, 2018
The one kid that has 20 sisters.
he's such a jack
Jack by UrFatDad69 January 3, 2019
A Jack is an absolute dickhead. He thinks he is always right, when he isn’t. However, he makes an alright friend, because of his sense of dark humour.
Jack by Scoobitywhapbap April 30, 2020
An abbreviation for hijack; to steal, or to take something you are not supposed to take.
Victim: What happened to the book I was reading? It was right here on my desk.

Sidekick: Somebody 'jacked it.
Jack by semantic historian May 21, 2013