0 a private joke that can only be understood by a limited group of people who have a special knowledge of something that is referred to in the joke
1 a joke that is understood only by a small group of people
We all enjoy an in-joke when we exaggerate and appear to be wounded by comments from the other side.
The name is a running in-joke that started among electrical engineers and technicians.
The title was an in-joke about their various rehearsal facilities and factory work ethic over the years.
The episode's theme gave the writers an opportunity to insert some in-joke dialogue that otherwise wouldn't have been put in.
Other times a fictional corporation is an in-joke carried across multiple products by the same games developer, director, or writer.
Allegedly he was very serious in the bar and this led to an in-joke whereby all his companions ascribed all new jokes to him.
The line had developed as something of an in-joke.
It has become something of an in-joke to buy the school clocks for classrooms.
