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fuck you jack 

when jack is being a cunt, this phrase is very useful.
Jack: " you're a waste of fucking space, John."
John: " Fuck you Jack"

you jump, I jump, Jack

A phrase referring to the movie Titanic starring Leonardo DiCaprio and Kate Winslet. When Rose (Winslet) is getting ready to go into the water as the Titanic is sinking, she famously exclaims to Jack (DiCaprio), "You jump, I jump, Jack!"
It is a saying that implies that you have faith or trust in someone if they are willing to do it with you.
ex1) P#1: I know that this food looks really gross but it tastes really good, try it.

P#2: Hey, you jump, I jump, Jack

ex2) P#1: This water looks really cold and dangerous.

P#2: Don't worry, I'll be with you the whole time.

P#1: You jump, I jump, Jack!

I'm all right Jack! 

(originally: "Fuck you, Jack, I'm all right!!" - described the bitter dismay of sailors ("jacks") returning home after wartime in the Navy to find themselves not treated as patriots or heroes, but ignored / sneered at by a selfish, complacent, get-ahead society - phrase was subsequently toned down for acceptable general use.)
Attitude of "every man for himself, survival of the fittest, devil take the hindmost", ... but also, that all the possible advantages (however gained), success (however won) and satisfaction (whatever the cost to others) belong to me first!" Narrow-focus, narrow-gauge pseudo-Darwinian selfishness glorified as a sensible philosophy of society and life.
People who find it hard to say "I'm all right Jack!" outright, say to anyone they find no longer useful: "I'm trying to get my life in order right now, so can you respect that, please?!..." (just before they throw themselves laughing into more fun and merry chaos!)
I'm all right Jack! by kofi May 19, 2003

jick-jack 

Quit jick-jacking around! We've got to get in the car and go!
jick-jack by Silas Almgren January 2, 2008

Jumbo Jack 

A Jumbo Jack is the most popular burger coming out of Jack In the Box. It is a piece of hamburger meat with some bread, lettuce, tomato, mayo, and onions.
"Hey, mother. I brought you a Jumbo Jack."
"They decided to be funny again and leave out the meat.."
Jumbo Jack by Shadow Flare December 10, 2005

Union Jack 

Commonly used but incorrect name for the Union Flag of the United Kingdom.

It should only be called the Union Jack when being flown at sea.

When flying from a flagpole on land "Union Flag"

When flying from part of a boat at sea "Union Jack"
Yank tourist "Ooooh look, the Union Jack".

Infinitely more intelligent Brit "Pillock, it's called the Union Flag".
Union Jack by Lord Leverhulme December 8, 2006