inside joke

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inside joke

A joke that is amusing to certain people but is not readily understandable or humorous to others. Oh, they're all giggling over some stupid inside joke. It's an inside joke, Mom—you wouldn't get it.
See also: inside, joke
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

inside joke

a joke that only certain people understand; a joke understood only by people who know certain facts and context. What you said must be an inside joke. It makes no sense to me.
See also: inside, joke
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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