Top Definition
-A name for a teenage girl who thinks she is hot but isn't. The name comes from mirror monsters' tendency to take pictures of themselves in promiscuous ways in front of a mirror, and then putting them on myspace
Gary- Man, look at that fugly girl out there!
Joe- Oh she's taking a pic of herself.
Hans- She's such a mirror monster.
by omglazergun March 16, 2008

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