Top Definition
A man who becomes grouchy with little to no warning, most often observed in the early mornings.
Liz: "Hey Chris wanna go work out?"

Chris: "I don't like these kind of suggestions so early in the morning."

Liz: "Why do you have to be such a grouchopotamus? Besides, it's like noon."
by Chriz10 June 13, 2011
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