Top Definition
A motherfuckin' grumpy-ass dog. He's always grumping and being rude. He doesn't have anything to grump about (except maybe that our McDonald's doesn't have $1 McDoubles) but he continuously grumps. Also a cheapskate and is not forthcoming with kisses or snugs.
Zack: Hey let's go smoke synthetic marijuana!!!

Em: I can't. I have to take this Grump Grump to the vet to get this cone off his head. He's grumping about it.
by Emboslice August 20, 2011

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