The ultimate head fuck.
A Jack will charm you, whoever you are. He will be the swetest person ever to you, make you feel like the only girl in the world and he's gorgeous.

But beware, he's a player, a liar, and a fighter with a hot temper.

He will make you fall, then let you down, beg for forgivness and you will forgive him and he'll do it all again, always.
Girl1: I love him, but I hate him. He's so confusing!!
Girl2: Looks like you've found yourself a Jack
by Μαλάκα December 05, 2011
Fucking best guy ever.
jack is awesome
by zane bear December 02, 2013
An amazingly sexy man with an enormous cock. Has really nice biceps and abs. He's faithful and will only make love to his soul mate, and he's thoughtful and loving. Great at cuddling and fantastic in bed.
"Gosh, you look exhausted!"
"Yeah, I was just making love to a Jack."
"O-oh yeah?? Well... I was just... Making love... To a sandwich."
"A sandwich?"
"No... I'm just super jealous and couldn't think of anything better than making love to a Jack."
"That's because there is nothing better."
by LickingLolliLollipops October 22, 2013
Type of dance popularized by early House music. Popularized by the song, "Jack Your Body" by Steve "Silk" Hurley. Not to be confused with Farley "Jackmaster" Funk..
"It's time to Jack"

"Jack your body"

"There were up there, Jacking. It was all, Ouija this, and wobbly that"

"Strung out, I jacked all night to the music"
by Komplizert June 30, 2012
The term jack can mean various different things. Such as;

Jack...A persons name

Masterbating....Jack-in off

Stealing..Man Ive been Jack-ed

Clothes....Jack-et

Card game......Black Jack

Wining...Ive hit the Jack-pot
A man yelled jack, he saw that he was jack-in off. At this point a hooded figure Jack-ed the man jack-in off. He stole his Jack-et. Inside was lots of money, the theive decided to play black Jack, on the first deal he hit the Jack-pot.
by Bigshaw aka Bradshaw July 06, 2011
another word for a five pound note
yea it was a jacks altogether
by ghte May 21, 2005
alone; single; partnerless; not in a group;
i'm on my jacks.
or
i'm on my j's (abbrev)
by Greaser November 09, 2003

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