An extremely cranky curmudgeon who regularly snarls at everything and grrs when displeased.
The term Grrmudgeon was coined by KL and GT when KL misheard GT call him a curmudgeon.
KL: I don't want to see anything! Grrr...
GT: You're such a curmudgeon.
KL: Did you just call me a grrmudgeon? TM that!