curbstoner
An unlicensed used car dealer of the sketchiest kind. Curbstoners typically buy undesirable cars (cars with a salvage title in particular) and will represent the car as their own. If the name on the title does not match the person selling the car, chances are you're being curbstoned.
I went to buy this awesome car I saw on Craigslist for super cheap and he told me he'd owned it for five years and done all kinds of maintenance on it. But when I looked at the title it didn't have his name on it and had been signed off a month ago! Fucking curbstoner!