Excessively short trousers resulting in the exposure of ankles, and in extreme cases, calves.
haha, look at them jack ups
โดย potusss 23 มกราคม 2007
1. Incrase sharply

2. Inject illegal drugs

3. Raise a car to be able to do mechanical work
1. Jack up the oil prices

2. Jack up heroin four times a day

3. Jack up the car and change the tyre
โดย osmokozmo 26 ตุลาคม 2007
Derogative term for trousers worn too short (approx 1-3 inches above the shoe), often with white socks underneath making the jack-up more obvious.
Check that guy's jack-ups
My best trousers had shrunk, resulting in fairly serious jack-ups
โดย Nicky 28 พฤศจิกายน 2004
commonly thought of as meaning trousers that are too short, 'jack-ups' are actually trousers that, surprise surprise, have been 'jacked' up. That means that the waistband has been pulled higher than necessary, possibly up to the naval (bellybutton) or chest.
person1: (indicating person2's trousers) ha, look, he's got jack-ups!

person2: actually, my trousers are just a bit short

person1's friend, person3: yeah thats what jack-ups are, you idiot

person2: commonly thought of as meaning trousers that are too short, 'jack-ups' are actually trousers that, surprise surprise, have been 'jacked' up. That means that the waistband has been pulled higher than necessary, possibly up to the naval (bellybutton) or chest.

person1 & person3: youre such a nerd
โดย A D 13 สิงหาคม 2007
To jack-up is a gymrat term for working to improve a specific muscel or set of muscels, especially women who want to firm-up their butts.
She is doin something to jack-up that ass. I'll bet she spends an hour-a-day on the stairclimber."
โดย Jim Inman 17 สิงหาคม 2006

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