to kill, steal, rape, pillage, etc.
Although other people are offering plausible etymologies for this word, I'm guessing it more likely is a "verbing" of a shortened version of mercenary, or soldier for hire. Just like narcotics officers became narcs, which then became a slang verb for snitching to cops, I think mercenary became merks, then merked became a slang verb for acting like a mercenary, or killing, robbing, etc.
He got merked for tellin' the wrong cat to kick rocks.
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