in-joke

[in-johk] /ˈɪnˌdʒoʊk/
noun
1.
a joke that can be understood or appreciated only by the members of a limited group of people.
Origin
1960-65
Examples from the web for in-joke
  • Irreverence demystifies art, it draws you into the in-joke, the inner circle of knowledge.
Word Origin and History for in-joke
n.

1964, from in + joke.