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1.
milk dan·druff
(milk dan-druhf)
-noun

crusty milk that dries and accumulates in a pale, flaky residue along the rim of the milk carton/jug. This buildup often occurs during pouring, and fallen flakes are notorious for ruining one's breakfast or appetite.
Scott: "Ugh! this huge flake of milk dandruff fell in my Apple Jerks this morning! I swear it was the size of my thumbnail."
by NickJE December 04, 2010
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