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A short blonde who can be a jerk but can also can be the nicest guy ever when you need him if you meet a jack don't let him go
Jack is the best guy ever
Jack by Grace c123 April 3, 2015
A guy who is a totally obsessive Virgin who will stop at nothing for a girl to touch him. Be careful, if you start to talk to him it's hard to get away from his latch.
Girl 1: I met this guy last night he wouldn't leave me alone

Girl 2: oh sounds like a jack
Jack by Sassy Sally October 1, 2015
Jacks tend to be very stuck up. They think they are higher than anyone else and are very vindictive people, as long as they're happy they don't care about anything else. Also jacks seem to be gold diggers and also like to flash there cash when they have some. Jacks are compulsive liars with out realisation and they loveeeee them self way too much and people don't find that attractive at all. Lastly jacks don't tend to take rejection very well.
Jack really needs to get his head out his ass crack, it aint no hat.
Jack by tom.is.a.prick February 28, 2017
it means cigarette. most commonly used in the D.C., Maryland and northern Virginia area
yo son do you have a jack i can smoke?

also, yo moe lets go hit a jack son.
jack by hardcore joe January 1, 2012
A very homosexual 6th grader who covers up the fact that he is homosexuality sexual by saying a term called mega fagot jack is a free loader and goes to people houses and lives with them but this is disrespectful as fuck
Kiran: hey what's up
Jack :gimme food mega fagot
Kiran: what is a mega fagot

Jack: it's you
Kiran:wdym
Jack: I'm a pussy to say it in front of people who would do something
Kiran: oh ok
Jack by Stopsayingfagot June 8, 2018
Jack is someone who will treat you like his one and only one minute and then he will leave and pretend you never existed. He will break your heart. Avoid all Jack's
Girl 1: "What is wrong"?
Girl 2: " I have just been dumped by a Jack
Girl 1: awwww no :'(
Jack by raaaaaaaaaaaaaawr October 1, 2011