Top Definition
The term used to describe someone being grumpy, cranky or overall a childish sleepy turd.
Robert: Sir, wake up! We need to leave this establishment before Phillip arrives to challenge you to a duel!

Joseph: Robert, leave me alone, for I am tired!

Robert: Joseph, quit being a Grumpy McShittypants!
by Fanchero November 18, 2010
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