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99.
slang for converse jack purcell sneakers, similar to the shortening of chuck taylor to chucks

jack purcell was a badminton player in the early 20th century.
jacks are comfortable and will always be hip.
by uplate March 06, 2005
 
100.
Jack is a small creature, of Irish origin, known for it's easily disrupted temper and compulsive lying. Jack's love to make threats that they well never deliver, not only this, but they get all up in people's faces when they are challenged, clicking their fingers as they do so, to try and seem larger then they really are. Most Jack's are pessimists, always attention seeking when a problem occurs.
"Hey billy, how are yu-"
A jack interrupts for attention.
"LOL OMG WHAT'S BILLY DOING?"
by Mysterious Jack Hunter October 26, 2013
 
101.
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
by mohommad August 19, 2013
 
102.
A total bitch
no one likes jack
by Jacksgversergh May 20, 2013
 
103.
The most awkward person that has ever lived.
Girl 1: Did you talk to Jack at the alumni meeting today?

Girl 2: Yeah, he's still as awkward as ever...
by jackisweird October 21, 2012
 
104.
jack is a kind lad, but has moobs and needs to get laid
"hey did you hear about jack?"
"Yea, about him still been a virgin?"
by the man1174 April 26, 2012
 
105.
An awesome basketball player. One of the nicest people you will ever meet. He isn't mean to anyone. He loves to meet new people but can be a little shy. He attends MBA and is very very smart. He is also very nice looking, cute, and has sweet hair. I love Jack more than anyone in the world!
Jack's secret best friend wants to hang out with a Jack
by weeeeeuuuiohn November 26, 2011