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1.
1. The proccess of milk becoming cheese; to curdle; to coagulate; to congeal.

2. A derogitory word to describe someone's mental state, in which to disintigrate from the inside.
a. Due to leaving the milk jug out all night, a layer had decomcheesed, spoiling the entire gallon.

b. That silly child's brain will decomcheese before he reaches high school if he continues to play all those video games.
by MTDraco December 04, 2011