Jewjack Share definition Flag to take something not belonging to you. to steal something. to jack something I jewjacked someone's car last night. I jewjacked some clothing from a local Macy's. I jewjacked a wi-fi internet signal Jewjack by Galactus78 March 28, 2009 0 0 Get merch Get the Jewjack mug. Buy Now — $32.95 See more merch