A horse that bucks and jumps to throw off its rider; a horse with a particular talent or reputation for bucking; also a rider who specializes in staying on bucking horses.
From 'buckjump' + '-er' (suffix meaning one who does something). This developed in American and Australian English to describe both the horses notorious for this behavior and the skilled riders who compete against them.
In Australian rodeo culture, the buckjumper is the ultimate test of horsemanship—some buckjumpers have become celebrities with names and reputations passed down through generations of rodeo competitors! It's essentially the horse equivalent of a professional athlete.
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