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
Get the Butt Dustmug. by Often butt duster September 4, 2009
Get the Butt Dustmug. by OOOO February 28, 2008
Get the butt dustmug. 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
Get the butt dustmug. A smelly dust like substance that forms on the back of your jeans/pants. This is caused from a deadly combination of going commando and not changing your pants for 10+ days.  This is also known as stink butt, stinky pants and stink junk.
by euroJuice May 18, 2008
Get the Dust-Buttmug.