Top Definition
Cheerio Dust is the powder that exists at the bottom of a bag of cheerio's. Usually the person who finishes the bag of cheerios gets all of the Cheerio Dust in their bowl. When mixed with milk, the Cheerio Dust turns into a snot like substance that sits at the bottom of your bowl, and makes you want to not drink the milk.
Mmmmmm, Cheerios." *Pours the last of the Cheerios into a bowl and gets all of the Cheerio Dust* "Aw shit, I got Cheerio Dust in my bowl, now I don't want to drink my milk.
by Joltingd July 01, 2011

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