have a plum in (one's) mouth(redirected from have a plum in mouth)
Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Encyclopedia.
have a plum in (one's) mouth
To speak in a manner that is indicative of a high social class. Primarily heard in UK. Because he always sounds like he has a plum in his mouth, none of us working-class sods can stand to listen to him.