a plum in your mouth
US /ə plʌm ɪn jʊər maʊθ/
UK /ə plʌm ɪn jʊər maʊθ/

1.
tener una ciruela en la boca, hablar con afectación
an affected way of speaking, as if one has a plum in one's mouth, often associated with upper-class accents
:
•
He speaks with a plum in his mouth, making him sound very aristocratic.
Habla con una ciruela en la boca, lo que le hace sonar muy aristocrático.
•
Her affected accent sounded like she had a plum in her mouth.
Su acento afectado sonaba como si tuviera una ciruela en la boca.