Knuckle Buster: A pneumatic tool for eliminating perfectly good paint from steel. Knuckle Dragger: A member of the engineering office or a mechanic on a nuclear powered vessel. Usually applied to describe a Boatswain's Mate on a floor vessel. KVAR: "Shows up as an apparent load on the system but does no actual work." Borrowed from the SI device for reactive electricity, utilised to describe a particularly worthless Electrician's Mate.