an odious, sedimentary mist derived from the anus containing fine particles of fecal matter when expelled through the spincter. Tends to be unpredictable and can result in what is known as a 'dookie stain'/'shart'
Oh NO!!! I just blew fecal dust all over my new pants, down my leg and into my shoe.
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FECAL DUST: It is not a fahrt. iT Is the dust coming from dried feces.
Fhe fecal matter i saw three days ago on the side road near my home has gone. Obviously, after it being treaded on bypedestrians it turned to fecal dust.
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