jack on

The least sexual act an individual can commit.
Woman: What are you doing today?
Man: I'm going to go to a funeral and jack on.
by adam12121212121212 March 20, 2010
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Jack

A dgaf kinda guy. Doesn't give a fuck what you think, and thinks that everyone loves him and everyone wants to be him. Has a lot of friends; popular.
Girls like him for his badass personality and teddy bear good looks.

Don't mess with jack though cause he can throw a punch. Has very bad anger..
Very LOYAL friend.
Jack is chillllll mayne.
by kmb11 October 29, 2010
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Jack

The cute friendly stranger who ends up becoming your best friend in the whole entire world. The guy who you can't get over when you think you've lost him. The guy who knows how to forgive, and never give up on people.

forgiveness,forever
Jenny is lucky to have found Jack, because he is a better gift than anything you could buy with money, and anything you couldn't with love.

love,friendship,luck
by speedilegs8 September 01, 2012
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jacked

Someone who is very strong and has very defined muscles, girls love them, too.
Wow! Roman Romanenko is jacked!!!!
by Alexandru October 18, 2003
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jacks

by Anonymous June 06, 2003
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Jack

Initially used in the show "Samurai Jack", as an alternative to dude. It has recently resurfaced and is being used instead of words like bro, broski, man, etc.
Person 1: Yo, what's up, Jack.
Person 2: Not too much, Jack
by Alexander Mel December 31, 2018
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Jack

Jack is the athletic, cute, tall blonde who’s really, really quiet. He has a small friend group of ALL boys & literally never has a girlfriend but wishes he did. Jack doesn’t like seeing people sad so if you’re upset, he’ll ask you what’s wrong, regardless if he knows you well or not. Jack is a good person to hang out with.
Jack, Tom, & Ryann are in their own friend group. Jack is probably the nicest one of them all.
by l.f.e October 28, 2019
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