1 definition by Dar123

Top Definition
A terminally grumpy person, often genetic. Can be modified for various states of grumpitity.

Cheer up, don't be such a Grumpus!

That Grumpus has been growling at me for hours.

A Slumpus (A sleepy Grumpus)

A Lumpity Grumpus (A lumpier than average Grumpus)
by Dar123 January 02, 2009

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