"bla" meaning in English

{
  "head_templates": [
    {
      "args": {},
      "expansion": "bla",
      "name": "en-interj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "imitative of idle, meaningless talk",
          "word": "blah"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2016, Richard Bean, Up On Roof",
          "text": "[…] Chair of the Women's Committee, bla bla bla, said she won't vote to let Turkey into the EU until Turkish men improve as lovers, […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of blah (“imitative of idle, meaningless talk”)"
      ],
      "id": "en-bla-en-intj-7B1s~Hl-",
      "links": [
        [
          "blah",
          "blah#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "bla"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "bla",
      "name": "en-interj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "imitative of idle, meaningless talk",
          "word": "blah"
        }
      ],
      "categories": [
        "English entries with incorrect language header",
        "English interjections",
        "English lemmas",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2016, Richard Bean, Up On Roof",
          "text": "[…] Chair of the Women's Committee, bla bla bla, said she won't vote to let Turkey into the EU until Turkish men improve as lovers, […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of blah (“imitative of idle, meaningless talk”)"
      ],
      "links": [
        [
          "blah",
          "blah#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "bla"
}