BAA Meaning of BAA in English ˌBaa, Baa, ˈBlack ˌSheep BrE AmE a ↑ nursery rhyme (=old song or poem for young children) :Baa, baa, black sheep/ Have you any wool?/ Yes sir, yes sir,/ Three bags full. Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012