by butt crustey December 06, 2006
When the skidmarks on your underwear dry out and start flaking off, turning into dust. It happens when people do not wipe up well after going to the bathroom, and when they do not change their underwear frequently.
I haven't changed my underwear in six weeks and now I think I'm starting to see some crust dust coming out of my pant leg.
by Chigglywiggly December 07, 2009
When you have dust on your booty and tthen it turns into booty crust
Also: a wierd Mexican with glasses
Also: a wierd Mexican with glasses
by Alberto bushnell March 19, 2015