one who jacks packs or one who steals backpacks
I left my backpack unattended for 1 minute. When I came back, I saw that Katie stole my pack. Katie is a pack jacker.
by Double K Pack Jackers October 20, 2011
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a person who is extremely attractive and charms like a maddogg, these are the people that steal your wifes.
'I was just on the phone to the 'wife-jacker'
'what did he say'
'your missus says that your dicks small compared to mine'
'is that all?'
'yeah and that if i want her back, she will be on the corner of hay and barrack street'
by tnuk<- April 17, 2009
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Someone who steals or copies someone elses style, slang, ideas, way of dress etc.
Like say i buy something first or do something first and you see me wearing what i brought or do what i did and you like it, then you turn right around and buy what i brought or do what i did thats what a swagger jacker is ya digz.
by myspace/gperico February 16, 2007
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Someone who takes your spot of the couch when you leave for less then a minute as if hes waiting for his opportunity to strike
Joe is a seat jacker so watch your shit.
by RKALLDAY September 23, 2012
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used mostly for someone giving a handjob while riding in a car
Man jennifer is such a car jacker! Did you hear about her carride with will last year?
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When one's arm is too sore or in extreme pain due to excessive masturbation. Usually interferes with everyday activities and can take weeks to recover from.
John: Dude I took like three Tylenol pills this morning

Brandon: What do you have the cold?

John: Nah, I got a bad case of the Jacker's Arm.
by Pandad March 24, 2009
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A single woman in her mid to late thirties who lies to a man, telling him that she is on the pill, while in fact she is not. She does this with the ultimate goal to get pregnant.
Can you believe she turned out to be a cum jacker? Now I'm a freakin' Dad.
by Judcliff April 19, 2010
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