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mushmouth

or mush-mouth

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018