PLUMMY Meaning of PLUMMY in English plum ‧ my /ˈplʌmi/ BrE AmE adjective 1 . British English informal a plummy voice sounds very ↑ upper-class2 . like a ↑ plum in taste, colour etc:a plummy wine Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012