- full of or tasting of plums
- Brit., Informal good or desirable: used esp. of a job
- Informal rich, full, and mellow: said of a sound or voice: often (esp. Brit.) used to suggest affectation
(comparative plummier, superlative plummiest)
plum +"Ž -y. In the sense of a voice, because of the supposed similarity to speaking with a plum in one's mouth.