jack mag

A pornographic magazine used to aid with beefing it.

Thomas had a closet full of jack mags until his mom found them and grounded him for it.

jack mag by Netch July 16, 2004

jack-off 

1) When an angry mother orders her son (named Jack) off a ride outside Tesco.
2) To masturbate.

1) "Get off the Postman Pat ride, you've been on long enough... JACK, OFF!"
2) "Dude, I am going to jack off."

jack-off by Soiled Undergarment August 15, 2003

the jack 

the phone in prison.

"Never get caught up wit beef over the jack, it aint worth it."

the jack by Dashottcalla September 14, 2008

Jackal

A dievious or mishchievous person; someone who wishes ill-fate upon another.

Bill is such a jackal for cheating on the exam.

Jackal by N3cr0n0mIV October 18, 2003

Union Jack 

1. The British flag.
2. Another name for masturbating(jacking off) in a group, such as in a circle jerk.

After helping to win the Revolutionary War, the 5 gay American soldiers celebrated by having a union jack on the Union Jack.

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Mark H. Active participant on UrbanDictionary since February 2004.

Union Jack by Mark H June 11, 2006

Jacksturbate 

The practice of the perfect masturbation sensation a.k.a. jacking off. Combined give off the ultimate orgasm that has the power to make your lower half explode!! >:-D

Non jacksturbater: Dude!!! When did you get a wheelchair??
Jacksturbater: It's a grim tale... I was so turned on I went beyond masturbation levels and I jacksturbated...
Non jacksturbater: Ohhhh... you're such a dumbass...

Jacksturbate by JoeManX June 2, 2009

jackal

Unsavory people who won't hesitate to rob or kill you for your paper. Usually come out at night.

"I see them jackals waiting for me round the corner, but they don't know I'm strapped"

jackal by Flan September 22, 2005