Top Definition
The dust that spreads from a ginger person's head normally in strong winds or through scratching of the scalp. Be careful, rust dust is very contangious. If the small particles that constitute a ginger man's head spread on to another human it will instantly turn them ginger too. Also known as the ginger disease.
John stop spreading your filthy rust dust around, you'll infect us all!
by homes1235 April 25, 2010
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