内うち輪わ受うけ

noun

inside joke; private joke; in-joke

Refers to a joke or understanding shared only within a closed group, often not funny to outsiders. Can also imply a private agreement or favor among insiders.

• 彼かれらの会かい話わは内うち輪わ受うけのネタばかりで、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.

• その冗じょう談だんは完かん全ぜんに内うち輪わ受うけだった。

  That joke was completely an inside joke.