Top Definition
A large pac man like monster which is what certain individuals turn into, it is only stoppable by the retardosaurus rex and consumes anything and everything, they are generally very loud as well, always yells the words om and nom, loves cookies
guy 1:oh god hes turned into The Nom Monster again
guy 2:COOKIES OMNOMNOMNOM
by Deed send May 15, 2009

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