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The grotty sludge that hardens to a putrid film on the botttom of a coffee mug when left on your desk for a few days, or weeks.
Look at the filthy mug muck that's formed on that lazy bastard's coffee mug!
by JJBrubaker April 15, 2007
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Aug 4 Word of the Day
Man's greatest invention, brain bleach removes bad memories and general DO NOT WANT moments. Every household should have a few gallons.
1: Dude, I just walked in on my parents.
2: Have some Brain Bleach!
by Andikun November 06, 2007
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