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4.
Dust that comes within the anal cavity unexpectedly.
Jeff farted and his butt got a little smokey afterwards. I said, "Damn dude, did you see that cloud of butt dust you just left on that little kid?"
by Jason January 15, 2004
 
1.
The speckles left on the toilet seat,seen when you get up from taking a dump.

Hay you left butt dust on the toilet seat,get back in the
there and wipe it off.
by OOOO February 24, 2008
 
2.
noun; the crusty, dusty particles of leftover fecal matter that is left on or around the anus. Occurs when wiping was not adequate.
Dude, yesterday I shook some of my butt dust out in Britney's chocolate milk. She didn't notice a thing, other than a slight nutty taste!
by Mookiechaser July 30, 2009
 
3.
When wearing dark pants and dust gets on the butt of them and wont come off.
Man I fell on the floor and now I've got butt dust.
by Often butt duster September 04, 2009