MOPPET Meaning of MOPPET in English mop ‧ pet /ˈmɒpət, ˈmɒpɪt $ ˈmɑː-/ BrE AmE noun [countable] informal [ Date: 1600-1700 ; Origin: mop 'stupid person, baby' (14-16 centuries) ] a small child Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012