to kill somebody using one's own fists; a brettastic method of putting the beat down on a rival rock-slinger.
white guy 1: did you hear what happened to Bill at the country club?
white guy 2: yeah, he didn't tip a Mexican, so that spic punch murdered his ass.
white guy 1: yeah Bill was never a good tipper.
black guy 1: yo that nigga be slingin' rocks on my corner.
black guy 2: son, punch murder his nidorous ass.