Top Definition
The highest fiber fictional grain cereal.
B-Hole Bradly: "I got explosions from within the anus, it's cause I was chowing down Grainus"
by Big P-Myth February 16, 2005
Quite possibly the most high fiber fictional grain breakfast cereal ever. Also quite possible the most repugnantly named fictional grain breakfast cereal ever.
B-Hole Bradley: "I got explosions from within the anus!"

Alejandro: "You must have been chowing on Grainus."
by Big P-Myth February 16, 2005
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