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A cake like substance or smell, or any combination of the two, that exudes negative vibes.
That weird brownish black shit that gets all caked onto your computer mouse or video game controller, that's the mustenance.

I left my dinner out over night and as a result my sustenance developed some mustenance.

The film that develops on the toilet seat of a public restroom is mustenant of a neglected cleaning.
by Captain Mustenance July 15, 2011
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