old school twitch language used by a streamer called Mercader who mainly played World of Warcraft

it was often used when the daily stream ended
Mercader: thks for watching blah blah....merc out
by Hadessio February 8, 2019
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To kill or beat someone within an inch of their life.

Also, to snuff or whipe someone/something out with one hit.
The kid with the pink skully got merced out.

He merced-out my sour patch kids because I was giving him the crook eye.
by crash February 25, 2004
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