mouthful of marbles

A phrase used to describe the speech of someone who mumbles when talking. I have such a hard time understanding him—he always sounds like he has a mouthful of marbles.

Common Names:

Name	Pronounced	Usage
Chester	['tʃestə]
Stasya	-	Russian
Inbar	-	Hebrew
Reto	-	German (Swiss)
Bogumir	-	Medieval Slavic
Milena	mee-LE-nah (Italian)	Bulgarian, Czech, Serbian, Croatian, Slovene, Macedonian, Polish, Russian, Italian