cop knock Share definition Flag When someone knocks so hard that you think it's the cops. You scared the crap out of me! Why'd you have to cop knock? I was smoking weed man and I thought it was the cops and I totally freaked out. cop knock by Turbo Werewolf March 15, 2005 0 0 Get merch Get the cop knock mug. Buy Now — $32.95 See more merch