A person who has all the right moves on the basketball court. Similar to a baller.

That cojack is the man to watch on the court.
by Natina November 17, 2005
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A person, usually a man, that is balding or has gone right bald.
Look at Zinedine Zidane, he's such a cojack these days.
by clasher July 7, 2004
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That kid is a mega cojack
by pedro September 14, 2003
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A masturbatory fantasy involving an attractive co-worker.
"Did you see what Jessica in Customer Service is wearing today?"

"Oh yeah. I think after work, I'm gonna have to run home and have myself a CoJack."
by HAL 9000 October 24, 2008
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