We found one dictionary that defines the word speak with a plum in mouth:

Miscellaneous (1 matching dictionary)

1. speak with a plum in mouth: Idioms

▸ Words similar to speak with a plum in mouth ▸ Usage examples for speak with a plum in mouth ▸ Idioms related to speak with a plum in mouth ▸ Wikipedia articles (New!) ▸ Words that often appear near speak with a plum in mouth ▸ Rhymes of speak with a plum in mouth ▸ Invented words related to speak with a plum in mouth