Source : Webster's Revised Unabridged Dictionary (1913)

Plummy \Plum"my\, a. [From {Plum}.]
   Of the nature of a plum; desirable; profitable; advantageous.
   [Colloq.] ``For the sake of getting something plummy.'' --G.
   Eliot.

Source : WordNet®

plummy
     adj 1: very desirable; "a plummy leading role"
     2: of a voice; affectedly mellow and rich; "the radio
        announcer's plummy voice"
     [also: {plummiest}, {plummier}]