Another way of claiming your rightful ownership to a seat. Similar to Quack Quack or Dibs. The art of stating Jacks is to make sure that a 3rd party hears you.
John walks back downstairs after getting some pizza, sees his spot is taken.

John:"Yo, Freddy I got Jacks"

Freddy:"He got Jacks?"

3rd party:"Yeah man move your ass"
by BallparkDanks February 15, 2009
A very moist boy-man-child with a creepy smile and a butters hairline. Jack will perv on girl's boobs and will, if encountered with the chosen female to bond with, he will perform a cleveland steamer to the woman's breasts. To meet a Jack is very unlucky and must be avoided at all costs, the Jack is most likely a French, thin young man that loves to moisten his very small ball sack.

He loves to poke you on Facebook nonstop and in real life if you are not careful. Always carry pepper spray if you ever come across Jack. He is a very dangerous one that has Ebola and Aids.
Girl: Ugh there was this creepy guy at the club, I think his name was Jack
by Mr I Fuck Children October 02, 2014
A very moist boy-man-child with a creepy smile and a butters hairline. Jack will perv on girl's boobs and will, if encountered with the chosen female to bond with, he will perform a cleveland steamer to the woman's breasts. To meet a Jack is very unlucky and must be avoided at all costs, the Jack is most likely a French, thin young man that loves to moisten his very small ball sack.

He loves to poke you on Facebook nonstop and in real life if you are not careful. Always carry pepper spray if you ever come across Jack. He is a very dangerous one that has Ebola and Aids.
Girl: Ugh there was this creepy guy at the club, I think his name was Jack
by Mr I Fuck Children October 02, 2014
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.
by BlondeBitch1975 February 22, 2014
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
Jack is the hottest guy around. Hes blue eyes and blonde hair cant be resisted and every single girl likes him. He is nice, athletic, and super funny.
I <3 jack
by lover91 February 25, 2012
Kind and funny. Good-looking, and in love with a Kristen. Always will be, even though they might have a crush on someone else.

Scared of telling someone how they feel, though the person usually feels the same way.
Kid 1: So Kristen and Jack got together.
Kid 2: No duh, they were made for each other.
by JK22 May 22, 2011

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