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 31, 2009
by Often butt duster September 04, 2009
by OOOO February 25, 2008
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 16, 2004
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 19, 2008