another term for masterbation. similar to choke the chicken, beat the bed post etc.
man, jeremy was crust dusting in class.
by butt crustey December 06, 2006
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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
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When you have dust on your booty and tthen it turns into booty crust
Also: a wierd Mexican with glasses
Jada: Jr u look like dust crust

Jr: shorty u got me there
Jada: you on Fleek bruh
by Alberto bushnell March 19, 2015
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