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in-joke

[in-johk]
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noun
  1. a joke that can be understood or appreciated only by the members of a limited group of people.
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Origin of in-joke

First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for in-joke

n.

1964, from in + joke.

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Online Etymology Dictionary, © 2010 Douglas Harper