Usually used to buy a certain amount of weed worth £5 but has now been morphed to just plainly mean £5 in London Street language (jafaican)
"Oi rob, have you got enough for the cinema?"
"Nah Fam, I only got a jacks, buck (lend) me a nugget (pound)"
by Fiverdotman April 16, 2007
A man that loves and adores everything about everyone. He doesn't discriminate or hate you no matter what you do. He's caring and understanding a knows what you are thinking at all times. He may do somethings that hurt or annoy you but he regrets those actions later. A Jack will always tell the truth no matter how hard it may be.
I think the world of my Jack :)
by Lily serendipity October 11, 2010
total asshole in the best way. doesn't know when to stop ; yet never needs to. funny, sexy, crazy, and all around amazing. amazing in bed, you'll be coming back for more. you'll hate him but love him at the same time. can't live with him ; can't live without him. can always always always make people laugh & you will always catch a smile on his face. fly, high swag, unmistakable. when you see him, you'll know. all around GOD. boss @ life.
guy 1: yo, you see that guy right there? he's the king.
guy 2: yeah, he has to be a Jack.
by killLaa. June 16, 2010
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
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
Toilet in Ireland. Usually the gent's toilet. Usually covered in piss maybe with a shite in the urinal. Accompanied by humerous and often informative grafitti.
Great stories on the walls in the Jacks! I've piss up to my knees though.
by D November 10, 2003
a spectacular man in bed! its crazy nuts he is soo good! Plus cute, smart, funny and strong. In Mythology means one who can fight without sword but using his "huge penis" against his wife. Any girl would want to date him. No one could say no to this guy.
Damn, Jack you were crazy nuts lastnight!
by pink pant hottie October 12, 2010

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