in-joke
inside joke
private joke

"I can always tell when there are a lot of teachers in the audience because they get the inside jokes," she said.

It was as though they had just shared an inside joke that no one else would understand.

Not bad for a series that started as an inside joke.

And he smiled as if amused by some inside joke.

Those people would never understand how important it was to find someone in life with whom to share the inside jokes.

The President replied that the reporter's question was an inside joke.

The others looked at one another, clueless as to the inside joke.

He does not like curves, something of an inside joke.

Maybe it was somebody's idea of a very inside joke.

Their familiarity with one another allows them to turn each performance into a series of inside jokes.

There were many inside jokes to popular television series and movies that played out during the series' run.

Most songs refer to events of the summer and include inside jokes.

We get a lot of the humor still, but I suspect that many inside jokes died with their times.

"Inside joke," Tom said, and made the chuckle sound again.

"They developed all these inside jokes," his wife, Sophie, said.

Inside jokes come more easily to the author than inner whinings.

The episodes also contain numerous inside jokes for fans of the game.

The success of the running gag or inside joke relies on the actor's delivery.

Either that or he's playing one of those baffling, arty inside jokes.

There are several inside jokes hidden in this episode.