in-joke
US /ˈɪn.dʒoʊk/
UK /ˈɪn.dʒoʊk/

1.
iç şaka, özel şaka
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.
Konuşmaları anlamadığım iç şakalarla doluydu.
•
You had to be there to get the in-joke.
İç şakayı anlamak için orada olman gerekiyordu.