in-joke
US /ˈɪn.dʒoʊk/
UK /ˈɪn.dʒoʊk/

1.
내부 농담, 사적인 농담
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.
그들의 대화는 내가 이해할 수 없는 내부 농담으로 가득했다.
•
You had to be there to get the in-joke.
그 내부 농담을 이해하려면 거기에 있어야 했어.