"drain the main vein" meaning in English

{
  "etymology_text": "A slang rhyming reference to the idea that a urethra is similar to a vein or artery.",
  "forms": [
    {
      "form": "drains the main vein",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "draining the main vein",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "drained the main vein",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "drained the main vein",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "drain the main vein (third-person singular simple present drains the main vein, present participle draining the main vein, simple past and past participle drained the main vein)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Bodily functions",
          "orig": "en:Bodily functions",
          "parents": [
            "Body",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2003, David Zielinski, A Genuine Monster, page 232",
          "text": "I got to drain the main vein, kiddo, so you just stay put.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To urinate."
      ],
      "id": "en-drain_the_main_vein-en-verb-u~WFOiiv",
      "links": [
        [
          "urinate",
          "urinate"
        ]
      ],
      "raw_glosses": [
        "(vulgar slang, of men) To urinate."
      ],
      "raw_tags": [
        "of men"
      ],
      "synonyms": [
        {
          "word": "urinate"
        }
      ],
      "tags": [
        "slang",
        "vulgar"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-drain the main vein.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/4/49/En-au-drain_the_main_vein.ogg/En-au-drain_the_main_vein.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/4/49/En-au-drain_the_main_vein.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "drain the main vein"
}

{
  "etymology_text": "A slang rhyming reference to the idea that a urethra is similar to a vein or artery.",
  "forms": [
    {
      "form": "drains the main vein",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "draining the main vein",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "drained the main vein",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "drained the main vein",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "drain the main vein (third-person singular simple present drains the main vein, present participle draining the main vein, simple past and past participle drained the main vein)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English slang",
        "English terms with audio links",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with quotations",
        "English verbs",
        "English vulgarities",
        "Quotation templates to be cleaned",
        "en:Bodily functions"
      ],
      "examples": [
        {
          "ref": "2003, David Zielinski, A Genuine Monster, page 232",
          "text": "I got to drain the main vein, kiddo, so you just stay put.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To urinate."
      ],
      "links": [
        [
          "urinate",
          "urinate"
        ]
      ],
      "raw_glosses": [
        "(vulgar slang, of men) To urinate."
      ],
      "raw_tags": [
        "of men"
      ],
      "tags": [
        "slang",
        "vulgar"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-drain the main vein.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/4/49/En-au-drain_the_main_vein.ogg/En-au-drain_the_main_vein.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/4/49/En-au-drain_the_main_vein.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "synonyms": [
    {
      "word": "urinate"
    }
  ],
  "word": "drain the main vein"
}