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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
1 1

Words related to mug muck:

coffee cum coffeee mug coffex lavazza mug mucus