Any vehicle on fire, engulfed in flames, burned.
Commonly used in radio traffic reports: "The 101 westbound is moving slowly because of a car-b-que off to the left at 7th Street."
When a car is being burned or completely burnt, and totaled, resulting in a burnt toasted shell of a car. - Car-B-Que.
Dude, check out that burnt car.
Yeah man, that car is a Car-B-que