"se polir le chinois" meaning in Français

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Idiotismes informels avec démonymes en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions verbales en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de polir et de chinois."
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "verb",
  "pos_title": "Locution verbale",
  "senses": [
    {
      "glosses": [
        "Se masturber."
      ],
      "id": "fr-se_polir_le_chinois-fr-verb-g3tEkxtK"
    }
  ],
  "word": "se polir le chinois"
}

{
  "categories": [
    "Compositions en français",
    "Idiotismes informels avec démonymes en français",
    "Locutions verbales en français",
    "français"
  ],
  "etymology_texts": [
    "Composé de polir et de chinois."
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "verb",
  "pos_title": "Locution verbale",
  "senses": [
    {
      "glosses": [
        "Se masturber."
      ]
    }
  ],
  "word": "se polir le chinois"
}