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A man whore that will cheat on you even after you have been dating for more than a year. He will break your heart and make it so that you wish you never loved him in the first place.
"He cheated?!?! well that's Jack for you."
Jack by jamminhillbilly23 May 18, 2020
Symbolic, alagorical name of that which is evil, bad, or wrong in certain novels, such as "Lord of the Flies."
"In 'Lord of the Flies' by William Golding, the character that represented evil was named 'Jack.' The character that represented good was named 'Roger,' and the character that represented order & rationality was named 'Piggy.'"
Jack by Carl J. Maltese April 15, 2007
Jack is someone who is exceptionally gay and has a secret(or many secret) relationships with boys. However he tries to hide this by chasing skirt and basically getting as much pussy as he can. Sometimes he may truly have feelings for the girl but he tends to prefer men. The signs of being gay are all there and many people say that he's gay but no one really thinks it.
Girl: You know Danny right?
Boy: Yes! Oh my god he is so fit!
Girl: What the fuck?! Your such a Jack.
Boy: No I'm not. Suck my Dick bitch.
Jack by BlondeBitch1975 February 27, 2014
1. in the washington DC / metro area a jack is a cigarette

2. like everywhere else it can also be to steal
1. yo man can i bum a jack?

2. fuck he just jacked my box of jacks
jack by niggermon August 6, 2010
a rank child that lets off farts every two seconds
smells incredibly bad.
jack by jackstinksofshit October 23, 2010
–verb (used without object)

To become so excited or laugh so hard that your throw up.

From the Episode "Apollo, Apollo" of the show 30 Rock.
Martha was so happy to be back stage at the concert that she Jacked five minutes before they went on.
Jack by Jesus it's your Wife October 28, 2010