(idea) by pukesick Tue Feb 29 2000 at 8:48:03
To knock unconcious with a weapon, a blow of the fist or an arm-grip around the neck. "I got a bum rap (unjust charge) for cold-cocking some ghee with the mugg (arm-lock) and rolling (robbing) him."

- american underworld dictionary - 1950
I like it!