"Melt faces" comes from the shadow priest ability "mind flay." When this ability was given to shadow priests, it was abbreviated as MF. When people asked how they died to a shadow priest (a previously weak class in World of Warcraft), they were told that shadow priests MF now. This became "melt faces", as the spell slows the target and it sounds cool.
My shadow priest can constantly melt faces in PvP.
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