A pretty cool guy, who's well-known as player. His full name is actually Jack Sparrow. If you ever see him, you should try to get his autograph immediately.
A: Dude man, who's that?
B: He's Jack, Jack Sparrow.
A: Dude, I gotta get his autograph
by unstoppableyolo January 01, 2013
A derogatory term which people from Cardiff use to describe people from Swansea, in South Wales. Etymology: stems from "Swansea Jack" a dog who assited in the saving of several dozens of persons from various drowning situations by barking loudly from the beach/docks and thus drawing the attention of passers-by who were able to really help.
Cardiff supporter: "Fuck me, I can't believe those soddin' Jacks are back in the Championship!"

Graffitti in toilet of The Woodville pub in Cardiff "Kill all Jacks!"
by Mr Snail April 17, 2008
Set of nice titties. A pair of boobs.
Whoah, that broad had a set of jacks on her!
by Rosenburg July 11, 2006
The act of chilling, especially on a Sunday with a hangover.
I hit it way too hard last night, I need to jack on the sofa.
by smash101 October 20, 2013
a guy that can be good but i swear to god if hes under 14 he is a ass i wouldn't give a fuck if he died right now and we have all met a jack before like this
ex:
me:hey jack did your brother come to sleep over to?
jack:uh yah
me:ok cool cause your a ass
jack wtf? why?
me:cause you woke me up last sleepover blasting your music
jack:yeah that was funny
me:flips table
by midnightrise August 11, 2013
Adjective:The state of being an immature, arrogant, prick.

Verb: "To pull a jack" is to get way too "handsy" early on in a date. This then followed by a drawn out, idiotic grudge.
"Dude, he was SUCH a Jack last night!"
or
"OMG! He pulled a total jack on our FIRST date! I dumped him"
"Is he still pulling a jack on you? It's been over a year."
by screwyoujack June 15, 2013
An abbreviation for hijack; to steal, or to take something you are not supposed to take.
Victim: What happened to the book I was reading? It was right here on my desk.

Sidekick: Somebody 'jacked it.
by semantic historian May 21, 2013
A total bitch
no one likes jack
by Jacksgversergh May 20, 2013

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