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A pungent slime that seeps from ones anus. Nustard can be either a liquid, dry flakes or powdery fecal matter.

Nustard build up when one refrain's from showering and or cleaning fecal matter from the anus.
Can you see that nustard stain on her pants?

Damn smells like nustard out here.

Wow your face resembles a pile of old nustard.
by Henry Faber December 10, 2007
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