Kneecapper
A person who loves to bust kneecaps.
Have you heard of what the Kneecapper did in D&D? It's insane!
kneecapper
noun: nickname for a handicapped person
Lars: "Dude, that guy crossing the street's wobbling in the crosswalk at about 0 mph."
You: "He's a kneecapper, duh."
You: "He's a kneecapper, duh."