calvinballEtymologyFrom Calvin + ball. From a fictional game without rules, played in the comic strip Calvin and Hobbes.calvinball means A deliberately absurd sport without fixed rules. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounA deliberately absurd sport without fixed rules.“And every time I would play serious tackle Nerf Calvinball out in the park somewhere, it played over and over in the back of my mind -- what would I do if I broke an arm?”