New York slang for claiming something to be true in which is actually a lie.
Sean: Yo, I heard you and Markus' sister hooked up last weekend after we chilled.

Davis: Bro, chill. Her and I are just friends. I simply walked her home; that's all. Stop 'jacking' that.
by GodofSlang December 27, 2016
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When one acts as though they know everything on the subject when in reality they know absolutely nothing on the subject.
Wow, Josh is really jacking right now, he knows nothing about boats.
by LargestPeen May 08, 2018
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When two or more people engage in physical combat.
I heard Mark and Tim got the jacking after school yesterday.
by @mikefromMemphis43 August 21, 2018
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To use drugs (mainly heroin) intravenously.
Man I had no idea she was jacking dope for so long! That's gonna make it so much harder to quit.
by MsUnderstood November 26, 2015
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