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1 definition by Jag atamis

 
1.
A vile beast that takes over ones girlfriend, turning her into a freakish werewolf that will howl at you annoyingly no matter what you say, and be a rotten bitch to boot
yeah the menstruation monster strikes again, poor bastard didn't see it coming. I'll miss him
by Jag atamis April 27, 2008