Knife-wrench Share definition Flag From Scrubs, a double-ended tool consisting of a knife and a wrench. Used by the Janitor to torment J.D. & Turk. Janitor: "Knife-wrench! For kids." Knife-wrench by Bastard-coated Bastard March 11, 2009 0 0 Get merch Get the Knife-wrench mug. Buy Now — $32.95 See more merch