comes from "merc" (pronounced "murk")
short for mercenary.
To be killed, murdered, or otherwise mercilessly and overwhelmingly defeated or put down. (
well executed and without struggle, the way a pro mercenary would do it.)
Became
popular in early 2000's. Also spelled "merc", "merk", and "merked."
"He murked that quarterback! No mercy. He ain't getting up from that
one."
"Did you see that fight? He murked that boy with one hit!"
"Don't
even think of challenging him, man. He'll murk you before you can
even reload. You got no chance."