crowd in a can
n.— «When Jordan Medich—who plays basketball for the University of Pittsburgh at Johnstown—was in middle school, Dane Medich attended his son’s games and was referred to as “a crowd in a can” because of how—and how loudly—he cheered for the team. When Jordan Medich played for the Knights in his junior and senior years, Dane was in the stands, cheering, as loud as ever.» —“Castle Crew has fun filling role as Norwin’s sixth man” by Les Harvath Tribune-Review (Pittsburgh, Pennsylvania) Feb. 9, 2007. (source: Double-Tongued Dictionary)