mushmouth
or mush-mouth
[ muhsh-mouth, moo sh- ]
/ ˈmʌʃˌmaʊθ, ˈmʊʃ- /
noun, plural mush·mouths [muhsh-mouths, -mouth z, moo sh-] /ˈmʌʃˌmaʊθs, -ˌmaʊðz, ˈmʊʃ-/. Slang.
a person who speaks indistinctly.