"side piece" meaning in English

{
  "etymology_text": "Jocular reexpression of the concept of a piece of ass on the side.",
  "forms": [
    {
      "form": "side pieces",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "side piece (plural side pieces)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2004, Wendy Williams, Karen Hunter, Wendy's Got the Heat, page 104",
          "text": "I was already putting two and two together that I was just a side piece — a booty call.",
          "type": "quotation"
        },
        {
          "ref": "2008, Lenora Adams, Baby Girl, page 105",
          "text": "You basically told him you're cool with being his side piece as long you're number one.",
          "type": "quotation"
        },
        {
          "ref": "2014, Shelly Ellis, The Best She Ever Had, page 246",
          "text": "I'm just tired of being treated like a side piece and not a wife.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A person with whom someone already in a relationship carries on a physical affair (not emotional affair) without having the intention of forming a serious relationship. Not gender specific."
      ],
      "id": "en-side_piece-en-noun-DWtR3WZl",
      "links": [
        [
          "affair",
          "affair"
        ]
      ],
      "raw_glosses": [
        "(slang) A person with whom someone already in a relationship carries on a physical affair (not emotional affair) without having the intention of forming a serious relationship. Not gender specific."
      ],
      "synonyms": [
        {
          "word": "mistress"
        },
        {
          "word": "bit on the side"
        },
        {
          "tags": [
            "vulgar"
          ],
          "word": "side bitch"
        },
        {
          "word": "side chick"
        }
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-side piece.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/13/En-au-side_piece.ogg/En-au-side_piece.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/1/13/En-au-side_piece.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "side piece"
}

{
  "etymology_text": "Jocular reexpression of the concept of a piece of ass on the side.",
  "forms": [
    {
      "form": "side pieces",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "side piece (plural side pieces)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English slang",
        "English terms with audio links",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2004, Wendy Williams, Karen Hunter, Wendy's Got the Heat, page 104",
          "text": "I was already putting two and two together that I was just a side piece — a booty call.",
          "type": "quotation"
        },
        {
          "ref": "2008, Lenora Adams, Baby Girl, page 105",
          "text": "You basically told him you're cool with being his side piece as long you're number one.",
          "type": "quotation"
        },
        {
          "ref": "2014, Shelly Ellis, The Best She Ever Had, page 246",
          "text": "I'm just tired of being treated like a side piece and not a wife.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A person with whom someone already in a relationship carries on a physical affair (not emotional affair) without having the intention of forming a serious relationship. Not gender specific."
      ],
      "links": [
        [
          "affair",
          "affair"
        ]
      ],
      "raw_glosses": [
        "(slang) A person with whom someone already in a relationship carries on a physical affair (not emotional affair) without having the intention of forming a serious relationship. Not gender specific."
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-side piece.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/13/En-au-side_piece.ogg/En-au-side_piece.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/1/13/En-au-side_piece.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "synonyms": [
    {
      "word": "mistress"
    },
    {
      "word": "bit on the side"
    },
    {
      "tags": [
        "vulgar"
      ],
      "word": "side bitch"
    },
    {
      "word": "side chick"
    }
  ],
  "word": "side piece"
}