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
Tom	[tɔm]
Gjurd	-	Norwegian (Rare)
Darius	[də'raiəs]
Avtandil	-	Georgian, Literature
Mwanajuma	-	Eastern African, Swahili
Otmar	-	German, Ancient Germanic