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The front part of a donkey. The back part is an ass. Thus the term jackass.
Always look a gift donkey in the Jack never in the ass.
Jack by world genius February 4, 2010
This guy is an ultimate farmer. He is rather large and a bit of a jack. He likes to think he has friends when in reality he is all on his 'jack'. he bigs himself up and pretends that he is hard but he is truly whipped.
"yo that kid's such a jack!"
jack by danny mayer November 15, 2011
jack is usually a sound kind of guy, jacks love oral sex and secretly are gay.
Most jacks are short for the term JACKass.

Blonde Jacks think they are all that and a bag of chips, but they are not. They think they know everything when all they really know is how to eat shit.

Jacks loves everybodys mommas so keep them locked up away especially your fathers, cause god knows jack would give them the death.

Jacks may be muscley and think they are great but beware as jacks are hot tempered and like to box anything in sight... even a blue bottle fly

Jack comes from the meaning of a simp

Jacks also likes big booooty boys for a good time, and usually love spending their time playing gay rugby and touching up other lads.
oh your sucha JACK!

he gave it to him up the jack last night
Jack by mohommad August 20, 2013
That dude is such a Jack, look at him.. Pathetic.
Jack by Fishtown March 11, 2010
Can be a skater a fag, usually into Avril lavigne and is into emo girls. Usually look like randal from recess and can half Polish
Jack Gobson,
Jack by gat-man-tamo May 28, 2010
A type of kid that destroys at COD, usually lives life "legit", and knows that allmost everyone is full of BS. Usually somone who is afraid of small things, like kids he doesnt know, and doesnt like to do things that are too crazy. Also somone who keeps all there thoughts in there head so as not to attract a butt load of haters.
"Hey Jack theres some kids in your backyard"
"Yea ik bro but i dont want to go back there"
"why?, are you scared?"
"Nah, im just Jack"

or

"Hey Jack, do you like that one kid?"
"no hes so gay, he changes his story everyday, hes Mcleading it up bro"
"oh"
jack by whoareyouman May 18, 2010