In-joke Definition
 ĭnjōk 
  in-jokes
  
    noun
  
 A joke, typically a humorous allusion, meant to be appreciated only by insiders.
 Webster's New World 
A piece of humour that is understood only by a group of people.
Well, it's a bit of an in-joke, but Fred has been going to start that diet "tomorrow" for the last few months.
We have an in-joke; whenever someone sings a wrong note, they wipe the mistake off their music with an obvious gesture.
 Wiktionary 
Other Word Forms of In-joke
Noun
Singular:
 in-jokePlural:
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