Top Definition
A crusty substance on a mans penis after having vaginal intercourse with a woman who is menstrating and not washing his penis for several days.
John realized after a week that blood left on his penis after having sex with a menstrating woman had turned into a Crustychum
by DirtyJoshDiablo2 December 15, 2010

The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

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