Jroof Share definition Flag Something incriminating that provides evidence against an adversary. Usually used when trying to prove someone guilty of something. The jroof is in the jelloThe act of her accompaniment to the crime was used as jroof against her Jroof by calygreyhound October 3, 2016 0 0 Get merch Get the Jroof mug. Buy Now — $32.95 See more merch