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To steal or use somthing that is not yours. It can apply to copying some aspect of another person as a means to make yourself look better than you really are. Or using an object of another person's without their knowledge. Also applies to talking about a concept as if you birthed it even though it was already around 100's of years before you were.
"Damn it, Jerry shop jacked my deodorant!"

"What's with Bob always shop jacking my style?"

"Dude, why do you always shop jack my jokes?"

Someone- "Hey, I just thought of the coolest thing, a place where people can hang out online, I'm going to call it, Facialbook."

Someone else- "You're a bag of hammers, you're just shop jacking facebook."
by costerc August 07, 2009
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