"fondo blanco" meaning in Espagnol

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en espagnol",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions interjectives en espagnol",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Espagnol",
      "orig": "espagnol",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de fondo et de blanco."
  ],
  "lang": "Espagnol",
  "lang_code": "es",
  "pos": "intj",
  "pos_title": "Locution interjective",
  "senses": [
    {
      "glosses": [
        "Cul sec."
      ],
      "id": "fr-fondo_blanco-es-intj-GbB02813"
    }
  ],
  "word": "fondo blanco"
}

{
  "categories": [
    "Compositions en espagnol",
    "Locutions interjectives en espagnol",
    "espagnol"
  ],
  "etymology_texts": [
    "Composé de fondo et de blanco."
  ],
  "lang": "Espagnol",
  "lang_code": "es",
  "pos": "intj",
  "pos_title": "Locution interjective",
  "senses": [
    {
      "glosses": [
        "Cul sec."
      ]
    }
  ],
  "word": "fondo blanco"
}