"porteñista" meaning in Spanish

{
  "forms": [
    {
      "form": "porteñistas",
      "tags": [
        "feminine",
        "masculine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "porteñista m or f (masculine and feminine plural porteñistas)",
      "name": "es-adj"
    }
  ],
  "hyphenation": [
    "por‧te‧ñis‧ta"
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "pro-Buenos Aires"
      ],
      "id": "en-porteñista-es-adj-DjOr-zsG",
      "links": [
        [
          "Buenos Aires",
          "Buenos Aires"
        ]
      ],
      "tags": [
        "feminine",
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/poɾteˈɲista/"
    },
    {
      "ipa": "[poɾ.t̪eˈɲis.t̪a]"
    },
    {
      "rhymes": "-ista"
    }
  ],
  "word": "porteñista"
}

{
  "forms": [
    {
      "form": "porteñistas",
      "tags": [
        "feminine",
        "masculine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "porteñista m or f (masculine and feminine plural porteñistas)",
      "name": "es-adj"
    }
  ],
  "hyphenation": [
    "por‧te‧ñis‧ta"
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Rhymes:Spanish/ista",
        "Rhymes:Spanish/ista/4 syllables",
        "Spanish 4-syllable words",
        "Spanish adjectives",
        "Spanish adjectives with red links in their headword lines",
        "Spanish entries with incorrect language header",
        "Spanish epicene adjectives",
        "Spanish lemmas",
        "Spanish terms with IPA pronunciation"
      ],
      "glosses": [
        "pro-Buenos Aires"
      ],
      "links": [
        [
          "Buenos Aires",
          "Buenos Aires"
        ]
      ],
      "tags": [
        "feminine",
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/poɾteˈɲista/"
    },
    {
      "ipa": "[poɾ.t̪eˈɲis.t̪a]"
    },
    {
      "rhymes": "-ista"
    }
  ],
  "word": "porteñista"
}