Urban Dictionary: Definitions by JJBrubaker

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mug muck

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 May 12, 2007

Get the mug muckmug.

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