"knee-trembler" meaning in English

{
  "forms": [
    {
      "form": "knee-tremblers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "knee-trembler (plural knee-tremblers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "langcode": "en",
          "name": "Sex",
          "orig": "en:Sex",
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            "Reproduction",
            "Fundamental",
            "Life",
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          "source": "w"
        }
      ],
      "glosses": [
        "A casual outdoor sexual encounter (commonly with a prostitute), usually in an alleyway or against a wall, with the man standing and the woman's knees raised."
      ],
      "id": "en-knee-trembler-en-noun-fQP3M52O",
      "raw_glosses": [
        "(slang) A casual outdoor sexual encounter (commonly with a prostitute), usually in an alleyway or against a wall, with the man standing and the woman's knees raised."
      ],
      "synonyms": [
        {
          "word": "knee-tremble"
        }
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-knee-trembler.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/b/b0/En-au-knee-trembler.ogg/En-au-knee-trembler.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/b/b0/En-au-knee-trembler.ogg"
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  ],
  "word": "knee-trembler"
}

{
  "forms": [
    {
      "form": "knee-tremblers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "knee-trembler (plural knee-tremblers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Sex"
      ],
      "glosses": [
        "A casual outdoor sexual encounter (commonly with a prostitute), usually in an alleyway or against a wall, with the man standing and the woman's knees raised."
      ],
      "raw_glosses": [
        "(slang) A casual outdoor sexual encounter (commonly with a prostitute), usually in an alleyway or against a wall, with the man standing and the woman's knees raised."
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-knee-trembler.ogg",
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  "synonyms": [
    {
      "word": "knee-tremble"
    }
  ],
  "word": "knee-trembler"
}