1. most desirable, prestigious, or advantageous
Usage: informal; British English
2. having the most plum-like qualities; most resembling a plum

Examples

• She landed the plummiest role in the entire production.
• He got the plummiest assignment of all the reporters.
• The plummiest jobs always go to the most connected candidates.
• That’s the plummiest posting in the entire diplomatic service.
• Among all the fruits, these were the plummiest and sweetest.