Top Definition
An animal whose sole evolutionary purpose is to express displeasure at a situation/person. "Mer" is both the Mercat's mating call and a signal it is about to attack.
"Mer," said Felix the feral Mercat, upon finding out his favorite stripper was out sick and was therefore unable to give him his customary Wednesday night lap-dance, "Mer mer mer."
by Council of Mer May 06, 2010

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