耳みみ年どし増ま

noun

young woman who knows a lot about sex from hearsay but lacks experience

Often used critically or humorously for a young woman who has picked up sexual knowledge from conversations or media but is still inexperienced. The term can sound dated or mildly derogatory.

• 彼かの女じょは耳みみ年どし増まで、話はなしだけは詳くわしいけど実じっ際さいは何なにも知しらない。

  She's a 'mimidoshima' — she talks a good game about sex but doesn't actually know anything from experience.