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A mummer is someone who wears a mask or fantastic costume while merrymaking or taking part in a pantomime, as at Christmas or New Year's.
Example Usage of Mummer
JimmyAwesome: Mummer rally! 2:15 PM 2nd and Reed! Do it!
mechafaux: Imperiex looks a Mummer.
Bert_Stewart: @emilystreet at the boxing arena next to Foreman Mills. It's Mummer'd up big-time.