膣ちつ洞どうMeanings1nounvaginal cavity; vaginaslangvulgar expression or wordSlang/vulgar term for the vagina, emphasizing the cavity aspect. Not a clinical term.ネットの下げ品ひんなスレで「膣ちつ洞どう」という言こと葉ばを見みた。I saw the word '膣洞' in a vulgar online thread.