in-joke
US /ˈɪn.dʒoʊk/
UK /ˈɪn.dʒoʊk/

1.
jenaka dalaman, jenaka peribadi
a joke that is understood only by a small group of people who are familiar with a particular subject or situation
:
•
Their conversation was full of in-jokes that I didn't understand.
Perbualan mereka penuh dengan jenaka dalaman yang saya tidak faham.
•
You had to be there to get the in-joke.
Anda perlu berada di sana untuk memahami jenaka dalaman itu.