A very common name for an eskimo that hates to admit he actually is an eskimo. Tend to be partly quiet/ and or be lazy.
A: Do you think Jack is an eskimo?
B: Duh! He is always ice fishing!
автор: Dontbeindenial 18 февраля 2011
Another way of claiming your rightful ownership to a seat. Similar to Quack Quack or Dibs. The art of stating Jacks is to make sure that a 3rd party hears you.
John walks back downstairs after getting some pizza, sees his spot is taken.

John:"Yo, Freddy I got Jacks"

Freddy:"He got Jacks?"

3rd party:"Yeah man move your ass"
автор: BallparkDanks 15 февраля 2009
A very moist boy-man-child with a creepy smile and a butters hairline. Jack will perv on girl's boobs and will, if encountered with the chosen female to bond with, he will perform a cleveland steamer to the woman's breasts. To meet a Jack is very unlucky and must be avoided at all costs, the Jack is most likely a French, thin young man that loves to moisten his very small ball sack.

He loves to poke you on Facebook nonstop and in real life if you are not careful. Always carry pepper spray if you ever come across Jack. He is a very dangerous one that has Ebola and Aids.
Girl: Ugh there was this creepy guy at the club, I think his name was Jack
автор: Mr I Fuck Children 2 октября 2014
Jack is a flamboient fello who enjoys reciveing more than giving. He is use to a bit of anal and enjoys the company of the younger generation. He is un-loved by alot of people and he makes it too obvious that he likes penis'. He likes to shove his tiny penis into the exhausts of shitty cars. He thinks that his SAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAB is the best thing in the world and he like to overuse shitty jokes to make people like him even though he's a cunt. He is a massive smelly Coon and he takes his time when walking past a playground full of small childeren. You can tell by the tiny boulge in his trousers that he is aroused by this.
QUICK RUN! I think there's a Jack about.

Holy shit Jack found us.
автор: Jacksafag911 14 января 2014
A giant tool and not a cool guy.
Guy One: "Man did you see that Jack earlier?"
Guy Two: "Oh yeah, he's a POWERtool."
автор: anon23987456310 13 декабря 2013
Sarcastic cunt who plays Dark Souls
Jack knew someone would post this
автор: NotTripl3XXXMayhem 1 декабря 2013
A 100% undesireable douchebag that will break your heart. Never trustworthy. Always looking for another girl to cheat on you with. Lies a lot. Criticizes you to no end.
My boyfriend Jack just stomped on my heart.
автор: mylifesucks123 30 ноября 2011

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