jack

1. To masturbate
2. Alternative word for Nothing
3. On Your Own (An abbreviated form of "Jack Jones")

1. "Come on, who doesn't feel the urge to Jack one off when you see her on the telly?"
2. "I've done Jack all day"
3. "I'm on my Jack at the moment"

by Wo Wogan September 9, 2006

Jack

An awesome dude. Always makes the funniest flipnotes. He is very nice and understanding. After getting to know him, he seems like a brother; a crazy brother, but a brother nonetheless. Also, he kicks @$$ at Smash bros. Brawl and Modern Warfare! His awesomeness level is OVER 9000!

Jack: Hey, check this out, I just finished the funniest flipnote.
Victoria: Cool, lemme see...
*after flipnote*
Victoria: LOL that was great! You and Aaron give us Aspies a good name!

by the-chick-with-the-notebook August 1, 2011

jacks

street slang in NYC for bags of crack

swallow those jacks my nukka, po-9 is rollin up!

by hustlenomics June 21, 2006

The Jack

Getting a girl up the ass and right before one is about to cum pull out and put it in here mouth. Upon putting it in her mouth scream, "I like pain" and then have the girl give you some teeth.

Last night I did "The Jack" with Rick's mom and it didn't even hurt this time!

by DoubleDboy October 7, 2011

jacked

Military - To be given a hard time/be yelled at from a superior rank for any deficiencies in your conduct/unifrom/etc.

Man, Private Smith got jacked by Sargeant Jackson today because his kit was out of order.

by ChuckA June 30, 2005

Jack

An insult to the "Noah" maneuver. A Jack is able to wear 10 girls as rings, one as a hat, and one on their good ol' Johnson.
In other words, the sex king.
A Jack only uses women as clothes.

Wow, i just got jacked last night.

by THEassking May 4, 2011

jack in

v.
1. To gain entry; to connect, as to a network.
2. To enter or connect by deceptive or unscrupulous means, esp. with malicious intent.

"He tried to jack in and take down their group from the inside after he heard what they were saying about him behind his back."

by tlc November 20, 2004