Top Definition
A Moinster, Noun, is a fictional character that is suppost to eat cats and Humans.
They Are Believed to live in Mansions.
Jon:Holy Shit, Thats A Moinster!
Jake: What The F*** is a Moinster?
Jon:A fictioanl character that eats cats
Jake:Cool
by JC180396 January 06, 2009
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