Top Definition
A case of diarrhea. The shits. The runs. Originated in Aroostook County in Maine.
Man, the food from that Chineese Restaurant down the street is terrible! I had the grunnys all night.
by defenestrator March 22, 2005

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An alternate spelling of the grunnys.
I can't eat cheese. It gives me the grunnies.
by defenestrator March 22, 2005

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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