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2.
A spinster over the age of 70 with no hair growing below her navel with a leathery crusty overused snatch.
Gloria was a great grandmother during the week but on the weekends her and her friends were a bunch of wild Crustangs. Crustang Sally you better slow that Crustang down. Bob was in for the ride of his life when he found out she was a Crustang.
by LabiaLicker June 05, 2012
 
1.
A Ford Mustang. A crusty Mustang. May be driven by someone with a mullet.
"Yo dude, let's take my car. I don't want to be seen riding in your crustang."
by Jeff Nolastein March 13, 2008