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A person who is cosidered 120% annoying to all other human beings. In some cases the person has the physical traits of a monkey and a rat.
Example 1:
Mom - "Daniel stop bothering your sister."
Daniel- "but mom Daniela is being such a munkrat."

Example 2:
Damn that kid over there looks like a munkrat.
by Mr. Jay B June 24, 2005
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