An improvised street weapon consisting of a
billiard ball tied into the toe-end of a
tube sock. The implement is
swung, generally at high speeds, in such a fashion as to severely injure the victim.
Dude tried to snag my wallet, so I busted him upside the head with my trusty madball. Now he's
whistling Dixie through the space where his front teeth used to be.
Also: Sean Penn used a variation of a madball in the classic 1983 prison flick "Bad Boys," where he puts a soda can in
a pillow case and uses it to beat the shit out of
Clancy Brown.