Crustiosis Share definition Flag An airbourne disease spread by crusty persons. Common sympoms are peeling of skin on face and/or genital areas. "Do you see that girllllll ? She gave half our school crustiosis just by looking at them." Crustiosis by Jorge Montana March 9, 2010 0 0 Get merch Get the Crustiosis mug. Buy Now — $32.95 See more merch