assclubber
Primitive caveman-like person or persons who is semi-obsessed with hitting random people on their derriere with a large club or other blunt object.
As I walked to Subway, some damned assclubber popped out from behind the building, scaring the daylights out of me. Lucky for me, I had a club of my own, and thumped his ass about 6 times before running back to the safety of my car.