in the DC Metro area a jack is a cigarette
You tryin' to smoke a jack?
by Nykwa December 29, 2009
Comes from the infamous "Car lot lingo". A "Jack" is a customer that strolls into a car lot usually holding a note pad or a portfolio of some sort with quotes from other dealerships, specs of vehicles etc. Sometimes Jacks may even show up with a measuring tape of some sort. The reason they are referred to Jacks is because they "Jack off" the car salesman to get information out of the salesman with out any intention of buying a car from them. In other words a Jack will shop you and research you and buy from somewhere else thus the term "Jack" for "Jacking you off" Only seasoned and experienced Car Salesman can spot a Jack at first glance, its usually the Green Peas or the inexperienced salesman that gets Jacked royaly with out even knowing it
John: "Ive got these two walkers in the front line!"

Peter: "Wow!, good call John!! hope you can sell them a car!!"

Paul: " HAHA, hey Chris look, those are big fat Jacks coming this way, poor John he's about to get power stroked!! Let the Jack session begin!!"
by Duke 562 February 10, 2010
The front part of a donkey. The back part is an ass. Thus the term jackass.
Always look a gift donkey in the Jack never in the ass.
by world genius February 03, 2010
slang term for phone
"Let me use the jack"
by Reddogg88 February 05, 2010
to hit someone or something with serious force
"He threatened to jack me in the face, if I didn't shut up!"
by Bob the Hobo September 03, 2007
(v) to deliver a devastating punch or blow to a person's body
That dude just got jacked in the face; I jacked him in the gut and that was the end of the fight.
by Dbaum May 15, 2007
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 07, 2010

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