n. An unregistered car dealer who sells vehicles from parking lots and other public locations while masquerading as a private seller; a person who sells stolen, rebuilt, or odometer-tampered vehicles.
Other Forms
Curbsiders don't always use curbs. Often they advertise in newspapers. If you see the same phone number on car ads throughout the publication, it's probably a curbsider.
—Will Higgins, “State sets trap for car-sale scammers,” The Indianapolis News, August 20, 1998
Wily curbsiders usually pose as private individuals who sell rebuilt, stolen or odometer-tampered vehicles. They own the cars or trucks for only short periods, if at all.

A curbsider is someone who purchases a vehicle for resale and not for private use.
—Tony Van Alphen, “Be wary of curbside automobile vendors,” The Toronto Star, April 15, 1998
1985 (earliest)
It’s a crime that’s very hard to control. Most of the cars are sold by "curbsiders," dealers who advertise in newspaper classified sections as private individuals forced to sell for personal reasons.
—Ellen Roseman, “Odometer fraud easier in metric so don’t trust used car’s reading,” The Globe and Mail (Canada), November 07, 1985
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