someone who slowly begins to lose their mind due to utter boredom, isolation, a creative block, cabin fever or all of the above, like the dude Jack Torrance in The Shining.
I hope this snow storm lets up or I am gonna be "Going Jack" soon.
by poser1212 January 28, 2011
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What you say when someone states something that we all know and dont need someone to tell us. Used as an insult.
A: Eminem's white.

B: Yes he is, you can go jack off with that knowledge.

A: Tupac's dead.

B: Yes he is dead, you can go jack off with that knowledge.

A: Miley Cyrus is a slut.

B: Yes she is, you can go jack off with that knowledge.

A: The Jonas Brothers are gay.

B: Yes they are, you can go jack off with that knowledge.

A: Lil Wayne is a terrible rapper.

B: Yes he is, you can go jack off with that knowledge.

A: Jessica alba is hot.

B: Yes she is, you can go jack off with that knowledge.
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a periodic plant in the family Asteraceae, usually seen in Europe and North America
We should go outside, I hear some Jack-go-to-bed-at-noon are growing at this time!
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