When a small group of people make up a joke (a phrase) while no one else is there (Sometimes because of an event that occurs, and then someone says something and it becomes an inside joke) and don't tell anyone about it, so every time anyone (whether from the group or not) says the phrase, they all start laughing like idiots for an unknown reason. It completely baffles people outside this group why it would be remotely funny. Most of the time it confuses them, or annoys the crap out of them.
Jeff started cracking up for no reason when I said "jelly"
Like wtf? Is that an inside joke?
Person 1: So I spread mayonnaise on my turkey the other day...
Person 2: Ahaahaahahahah!!! MAYONNAISE!!!!
Person 1: Wha-
Person 3: DID HE JUST SAY MAYONNAISE??!! AHAAHHAHAHAHAH
Person 1: Um??
Person 1: I checked out books from the library for my little brother, he seems to like The Very Hungry Caterpillar
Person 2: HAAHHJHSHJAHJDJHGGJDG HAHAAHHAHAHHA S SHAHAHAHAHAHHA
Person 3: *wheeze*
Person 1: .....
Person 1 walks away
Like wtf? Is that an inside joke?
Person 1: So I spread mayonnaise on my turkey the other day...
Person 2: Ahaahaahahahah!!! MAYONNAISE!!!!
Person 1: Wha-
Person 3: DID HE JUST SAY MAYONNAISE??!! AHAAHHAHAHAHAH
Person 1: Um??
Person 1: I checked out books from the library for my little brother, he seems to like The Very Hungry Caterpillar
Person 2: HAAHHJHSHJAHJDJHGGJDG HAHAAHHAHAHHA S SHAHAHAHAHAHHA
Person 3: *wheeze*
Person 1: .....
Person 1 walks away
by Uncreative Blob February 7, 2018
Get the Inside Jokemug. An inside joke is a joke that only a few people understand because it was based off an incident or something another person said.
by hiiiiiiooo111 October 26, 2019
Get the Inside Jokemug. by ffjamew2 October 23, 2022
Get the inside jokemug. Illegal. Do not make one into an Urban dictionary definition. They are Jokes that only your friends know.
Me: Ima make a definition only my friends will get.
B-B-Birthday party: A place where you hide all the dead bodies.
Urban dictionary: FBI your under arrest dor illegal possession of Inside Jokes.
B-B-Birthday party: A place where you hide all the dead bodies.
Urban dictionary: FBI your under arrest dor illegal possession of Inside Jokes.
by udontknowmeidontknowu January 4, 2021
Get the Inside jokemug. Person 1: Remember when…
Person 2: Shiiit I remember haha.
Person 3: What the fuck are you guys talking about?
Person 1: You weren’t there to see it, it’s an inside joke.
Person 3: Fuck well don’t I look dumb.
Person 2: Shiiit I remember haha.
Person 3: What the fuck are you guys talking about?
Person 1: You weren’t there to see it, it’s an inside joke.
Person 3: Fuck well don’t I look dumb.
by J4VA January 3, 2023
Get the Inside Jokemug. Liberty and I have so many inside jokes including "omg im so popular"i can't keep track of all of them
by Janie(spongebob) March 16, 2019
Get the Inside jokesmug. by FreshNick May 17, 2020
Get the Inside jokemug.