An amazing guy, makes any girl feel like the luckiest person ever - tall and strong can pick you up despite you not thinking he can. He knows how to make you laugh and has a lovely character - If you are not careful, you will spend hours on the phone to him or when you are with him you can see through his eyes - depite their awesome sexiness
If you are so lucky to meet a "jack" you will spend countless hours with him and find yourself with a most esteemed companion even though he can be cheeky sometimes......
may have a badboy past but thats ok because he is easily changed with his own mistakes
damn! you met a jack!!!!!
by Sunnies January 17, 2011
slang for a £5 note... comes from "the jackson five"
lend us a cockle.... sorry mate only got a jacks on me...
by jackmandigger May 15, 2007
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
J - Just
A - Antoher
C - Confused
K - Kafa
That guys is a fucking J.A.C.K!
by Dudet July 15, 2012
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
A self centered jerk, is very ugly and not a very good person or friend to you. He doesn't think much of others.
Come on! Don't be a Jack!
by Lynsey Lover March 12, 2012

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