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When the food that has been consumed causes your stool to have a very distinct green color. Defacating a Green Grungie can also include discomfort, wetness, and/or strong odour.

Low grade meats and high grease content have a higher likelihood of causing Green Grungies to form. (McDonalds, KFC, etc.)
"Man I've got a bad case of the Green Grungies"
by BubBLeB0y April 07, 2008
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