pooh-bah noun alsopoo-bah\ˈpü|bä\ (-s) Usage: often capitalized P&B Etymology:Pooh-Bah, name of character in Gilbert and Sullivan's opera The Mikado (1885) bearing the title Lord-High-Everything-Else 1.: one holding many public or private offices < the municipal treasurer … is usually assigned additional duties and often becomes a veritable village poo-bah — J.R.Hayden > 2. a.: one in high position b.: one who gives the impression of being a person of importance