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verb (used with object). The act or instance of hijacking an unprotected WiFi signal from a nearby wireless network without the owner knowing it. Best conducted whilst sitting as inconspicuously as possible near a window to avoid exposure; also because Wi-Fi signals travel better through glass than through solid walls.
1) "Hey John I know you're on the road but I just wanted to see if you got my e-mail."

"Yeah man, I just pulled over in front of some random house and fi-jacked their wireless connection with my iPod to check on it. Looks good."

2) "Hey John how much are you paying for internet access?"

"Actually nothing. My neighbors are dumb enough to leave their wireless network open, so I just Fi-Jack them them all day long."
Fi-jack by Oatmeal raisin the dead February 10, 2010
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Captain Jack Harkness 

Someone so sexy, his own name is a pickup line.
*Walks into a bar and sits next to random woman*
Hey, Captain Jack Harkness
*Everybody in the bar has sex with him*

Hit The Road Jack 

Hit the road jack is a slang term to use whilst firing an employee, or breaking up with someone as a couple. Usually whenever the recipient does something that negatively impacts the person who uses the phrase.
"Hit the road Jack, you've already fucked up twice."
Hit The Road Jack by oldedefinitions February 19, 2018

ninja jack 

The ninja jack. The act of jacking off silently (quickly in most cases) and without those around you knowing that you had even done so.

Usually refers to jacking off while someone is talking on the phone (I.e. a girlfriend calls and you rub one out while she talks about something random).
Girl: "Hey, so anyways my day blah blah blah"
Guy: "yup, sounds good"
Guy::touching himself/finishes::
Girl: "So- what do you think?"
Guy: "Sounds like a plan. We meet at your parents house for dinner tomorrow night"

Ninja jack successful.

Girl: "What's wrong- you sound winded"

Almost.
ninja jack by The Noob Tuber April 2, 2010

Flat Jack 

A Flat Jack is a square of breaded processed chicken that can be heated up in a toaster instead of an oven, making it a quick and convenient lunch option or snack food.
It's like a chicken nugget that is the size and shape of a Pop-Tart.
Hey man, I'm hungry, but I dont want to heat up the oven or turn on the stove for something small. What do I do?

Oh, no problem. Stick a couple Flat Jacks in the toaster and you're good to go dude.

Thanks brah
Flat Jack by Anon7301 May 7, 2011

buttery jack 

When ones partner gets two sticks of butter and inserts one into the anus and uses the second stick of butter as lubricant for a handjob.
"Dude, that chick, Jessica, gave me a buttery jack yesterday!"
buttery jack by BerserkBun February 24, 2015

The Jack Gay Song 

The jack song of a retarded gay ass dumbo named Jackson payne
Girl 1: who's that gay ass man
Girl 2: that is jack want me to sing the song
Girl 1: sure
Girl 2: so no one told you jack was gonna be this gay 'clap clap clap clap clap' the way he talks he walks and he has a fat chode that is the jack gay song