demolition derby

noun

1. a contest in which drivers deliberately and repeatedly crash old cars into each other, on a racetrack or in an enclosed area, with the winner being the last vehicle still moving after all others have been disabled.
2. Informal. any event or circumstance having the chaotically destructive character of such a competition.

noun

1. mainly US and Canadian a competition in which contestants drive old cars into each other until there is only one car left running