in-joke
US /ˈɪn.dʒoʊk/
UK /ˈɪn.dʒoʊk/

1.
نكتة داخلية, دعابة خاصة
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.
كان حديثهم مليئًا بـالنكات الداخلية التي لم أفهمها.
•
You had to be there to get the in-joke.
كان عليك أن تكون هناك لتفهم النكتة الداخلية.