身み内うちネタ

noun

inside joke; in-joke

A joke or story that only a close group of people (family, friends, colleagues) would understand, often referencing shared experiences. Colloquial.

• 彼かれらの会かい話わは身み内うちネタばかりで、私わたしにはさっぱりわからなかった。

  Their conversation was full of inside jokes, and I couldn't understand it at all.

• 飲のみ会かいで身み内うちネタを連れん発ぱつするのは、新しん入いりにはつらい。

  Constantly cracking inside jokes at a drinking party is tough on newcomers.