Wiktionary
roofball
n. A game in which players attempt to keep a ball in play by alternately bouncing it off a sloping roof.
Usage examples of "roofball".
Over at the pavilion the rubber thump of Roofball and the click of checkers call to his memory, and the forgotten smell of that narrow plastic ribbon you braid bracelets and whistle-chains out of and of glue and of the sweat on the handles on athletic equipment is blown down by a breeze laced with children’s murmuring.