It means, good or bad, amazing or embarrassing depending on the way it is used.
For example, them shoes are jag mate

OR
That girl was well jag
by Conrad Maximilian April 14, 2019
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A name of a guy that has a long ass name and is the tallest motherfucker you ever met and and plays so much video games
by Da man chicken September 26, 2018
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A. To, through no skill of your own, make something fortuitous happen. or
B. To seriously screw up something. or
C. To burp the worm (masturbate).
A. You bastard! How did you jag that? (after winning a prize)
A. Somehow jagged that one! (after fluking a pool shot)
B. Oh fuck! I jagged it! (after missing a pool shot)
C. I didn't have anything to do, so I jagged it 'til it bled.
by Dav Byrne January 7, 2006
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A verb to be used when one means serious business, and wishes to express their anger. Can mean to hurt, burn, kill, or basically just fuck the person up.
John: You know steve, you're kind of a tool
Steve: Shut up before I jag you.
by Friendly Niggerhood Spiderman February 10, 2014
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Damn did you see all the JAG's driving on Colima last night.
by scootard July 8, 2010
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a load of banded lumber, or loose lumber that is stacked on the forks of a forklift.
by Ron-0 December 5, 2007
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a reference to marijuana commenly used by old school hippies.
let's go jag it up(smoke weed).who's holding the jag.
by count jagula July 8, 2005
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