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motoball

n. A game resembling football, but with players (except the goalkeepers) riding motorcycles, and with a much larger ball.

Wikipedia
Motoball

Motoball (Motorcycle Polo) is similar to football, but all players (except goalkeepers) are riding motorcycles, and the ball is much bigger. Motorcycle Polo first began as an officially-organized sport in the mid-1930s. In France, there are organized motoball competitions, and the sport was included in the inaugural Goodwill Games.