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1.
The term "Grumpleupagus" is a combined term, taking inspiration from Sesame Street character, Snuffleupagus, and the word "grumpy". Grumpleupagus is a noun used to describe a rather cranky being. In modern mythology, some say the grumpleupaguses used their long trunk to shoo away persons they find annoying.
Oh John, you're such a grumpleupagus. What's the problem?
by Bailey Sablock February 21, 2008
 
2.
A person who is extremely grumpy, a play on the Sesame Street character, Snuffleupagus.
My, oh my, are you a grumpleupagus today or what?
by RNDLMC September 10, 2006