It says that urban dictionary rejects inside jokes so I decided to test that.
that is a very funny inside joke
by sir climer the great May 12, 2017
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A joke, usually between no more then 10 people, and usually sounds like complete nonsence if you are not part of it. Usually, It is something that happened or what someone said that was really funny at the time.

If someone who was not there when whatever happened, and are told the story of what did, it doesn't count as an inside joke with that person.
Rachel: Lightly toooooast
Olivia: Hahahaaa
Alyssa: What?
Olivia: Inside joke

Jill: Heee-yaa!
Omi: Hahahaa...Hee-yaa!
Jill: No. you can't do it. you weren't there.
by IcedTeaaaa August 18, 2009
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Something two or more annoying people make up so they can exclude others.
Person: Hi. Did you take that test? I think I got that one about elephants totally wrong!

Group of annoying people: PURPLE ELEPHANT!!! *burst out laughing*

Person: Ummmm....

Group: Its an INSIDE JOKE. We can't tell you what it means!

Person: I don't care what it means.

Group: GOOD CUZ WE'RE NOT TELLING YOU!

Person: Umm okay...
by 3RDIE November 23, 2010
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A joke that is only understood by a group of people and isn't allowed on urban Dictionary
-what is so funny about fenir
-you wouldn't get it its an inside joke
by Xxjoe_mamaxX October 19, 2021
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A joke in which you do not want to be part of.
Today Jenna did something and now is part of many inside jokes with my friends.
by The man of blood and death November 18, 2018
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The mortal enemy of the urban dictionary, since the begging of time, when they were just infants, urban took joke's stick, then a full on war that lasted 100,000,000 years saw an urban win, because it won urban does not allow insider jokes to exist within it
by HalfSICKO April 12, 2021
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n. somthing incredibly funny that only you and your friends who were there at the time will ever understand. Ever.

Meghan: The s*** has hit the fan. Doooodleootdoo doo.
Multiple people: AHHH HA HA HA HA HA HA HA! oh gahh that was funny.
Victor: i don't get it.
Me: Inside joke.
by Kevin Garcia December 7, 2005
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