Define Merc'd Meaning

Basically to have gotten fucked up.

see: merc

It comes from the word "mercenary".

In online gaming getting "merc'd" is to get defeated in the extreme by another player. The slang origin became adopted in online gaming taken from known player (TTK)Mercenaries; During the highlight era of Call of Duty 4: Modern Warfare, for sometimes seemingly almost impossible kills and kill/death ratios. While being at some times "silly", for example bunny hopping or battling through a session with a weak pistol while still maintaining control of the map.

The only video released by (TTK)Mercenaries, showing a small handful of his random aliases.

to kill a bowel or cigarette with excessive force, usually implying a refill or replacement is really needed.

To have the figurative heat turned up on you, as in the MERCury on an old-school thermometer rise as heat is applied.