Top Definition
A genetically engineered hybrid cross between a human being and a rat.

On the "rat monster" episode of the SciFi Network prank show "Scare Tactics", a gay PETA activist was frightened during a prank involving a midget in a scary rat costume.
After gently fornicating with her beloved pet male rat, Susan prayed that she might soon birth a beautiful baby rat monster.

The faggot squealed like a bitch when the rat monster scurried across the laboratory floor.
by RVDestroyer69 February 08, 2008
6 Words related to rat monster

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