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A person who is genuinely hilarious in the way they look and or act. Only people who are EXTREMELY hilarious to watch can be classified as this, and only a few true chucklemonsters have been spotted.
You: "You see that retarded girl scribble on her window and then nod in approval? That was hilarious!."

Friend: "Yeah i know shes a real chucklemonster!"
by Batman2.0 September 09, 2009
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