Poo dust

Fecal matter residue left near the opening and linings of the anus that was not properly wiped off and has thus solidified. These poo particles can remain for days and are often only expelled through showering or through farting which causes these particles to explode in small clouds of dust, leading to the term "poo dust."

(Friend to roomate) I just farted and I'm pretty sure the last remnants of my poo dust have now evaporated.

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