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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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2
Jacking refers to the act of robbing or stealing and can refer to jacking one person in particular or can refer to say lyrics from a tune.
"Did you hear what happened to Leroy Brown on the 93 bus last night? He got jacked by a group of kids... they took his phone".

also:

"That 50 cent is whack... hes always jacking lyrics from other mans tunes... allow him"
by David Fisk April 08, 2006
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3
Masturbating, short form of jacking off. Usually used for male masturbation. The female form is jilling. Used on porn boards including jol and literotica.
She wasn't in the mood for sex, so as soon as my girlfriend left, I put on some porn and commenced to jacking.

by Olivia_yearns November 17, 2006
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4
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 February 28, 2016
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5
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 June 03, 2018
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