jack rolling

This is the name applied to a crime born in South Africa's townships where men gang-rape their victims in retaliation for a perceived slight.

Women in the Midlands town have been urged not to go out alone after dark due to a wave of so-called "jack rollings".

by Dave Eietz September 5, 2005

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slow jack

To masturbate at a reduced pace. Sometimes performed for hours at a time.

"Yo man, slow jacking has so many benefits. Why just the other day I was cooking while I jacked, try the oven mit, it's just like givin' yo'self a stranger."

by Billabong aka Buck-deezy February 16, 2006

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jack knife

When a trailer being hauled loses traction and begins sliding to the side of the vehicle that is hauling the trailer. Similar to a rear wheel drive vehicle fish tailing and losing control.

Passenger: Dude you better slow down on that turn, its pretty icy out there.

Truck Driver: You're right, I wouldn't want to jack knife and cause a wreck.

by afrojim2009 June 16, 2010

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Jack

Nothing. Used to describe what a person is incapable of doing or what a person has no clue about either by learning or experience.

Broadly equivalent to Jack Shit, Diddly Squat, etc.

Guy1: I know that Obama is a communist and a muslim. He is also not a citizen.
Guy2: Yeah, what's your name?
Guy1: Jack
Guy2: Yea, Jack. Don't know Jack.

by blueliner49 February 7, 2010

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