下しもネタ

noun

dirty joke; blue joke

A joke or story with sexual or scatological content. Casual register.

• 彼かれは飲のみ会かいでいつも下しもネタばかり言いう。

  He always tells dirty jokes at drinking parties.

noun

indecent topic; bawdy subject; sex talk

A conversation topic that is sexually suggestive or crude. Broader than just jokes; can refer to any lewd discussion.

• 職しょく場ばで下しもネタは避さけたほうがいい。

  It's better to avoid indecent topics at work.