Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Clothesmuu-muumuu-muu /ˈmuː muː/ noun [countable] American English DCCa long loose dressExamples from the Corpusmuu-muu• She was blocky under her dark grey muu-muu.Origin muu-muu (1900-2000) Hawaiian mu'umu'u, from mu'umu'u “cut off” ldoceonline.com