English Alternative forms cluster-ball Etymology From cluster + ball. Noun clusterball (plural clusterballs) (slang, euphemistic) Synonym of clusterfuck. 2014, Cynthia Brint, Maybe Fate:I'd known it was going to be a giant cluster-ball when everyone saw me, but... I still wasn't prepared for how angry they all were.Wikiwand - on Seamless Wikipedia browsing. On steroids.