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to go on someones online profile or account by stealing there password or the owner of the profile let them on.
"Ronda's talking to me on facebook talking about how awesome Darin is."

"No, its probably just Darin Co-jacking on Ronda's profile."
co-jack by akeith8 February 7, 2012
Related Words
1. (verb): When someone attempts to steal the limelight or credit for something, under the pretense of "helping", but really makes himself just look bad in the process.

2. (noun/verb): Inadvertent hijack

It is often meant to help, but through some devious alterior motive or actual impact over intent, it ruins the moment. People who do this are usually associated with santorum.

I
Yo, did you see what Kanye did at the Grammy's? Yeah, he totally co-jacked Taylor's moment.

In an effort to help Frank's presentation, Lizzie co-jacked him, taking all the credit when all she wanted to do was make sure the boss knew she helped too.
co-jack by lepenseur73 October 12, 2011
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.
cojack by Natina December 26, 2005
A person, usually a man, that is balding or has gone right bald.
Look at Zinedine Zidane, he's such a cojack these days.
cojack by clasher July 7, 2004
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."
CoJack by HAL 9000 February 28, 2009
That kid is a mega cojack
cojack by pedro September 14, 2003