A casual descriptor for a convertible, roadster, or modified vehicle operating without a roof. This applies to cars with retracted soft tops, removed hardtops, or custom builds where the roof has been permanently chopped off. The absence of a structural roof requires heavy reinforcement in the floorpan and chassis to prevent the body from flexing under load.
Heard on the job
The customer brought in a topless classic Mustang that needs severe structural reinforcement in the floorpan.