"mmmm" meaning in English

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      "examples": [
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          "ref": "2009 January 15, “Leigh Paatsch's reviews of latest movies at the cinema”, in Herald Sun",
          "text": "It is often very good, but falls short of being truly great (mmmm, been a bit of this syndrome going around lately for blockbuster releases).",
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  "lang_code": "en",
  "pos": "noun",
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  "word": "mmmm"
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