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. by Allister Smith December 28, 2019
Get the Inside the park home runmug. 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. The thing that Urban Dictionary hates and will not let you publish a definition if it includes an inside joke
by nabrU yranoitciD January 13, 2020
Get the Inside jokesmug. by Your dad loves me January 27, 2023
Get the Inside out closetmug. person 1: what day is it again? i forgot
person 2: today is april 3rd why?
person 1: that means it's national cum inside me day, you know what to do
person 2: today is april 3rd why?
person 1: that means it's national cum inside me day, you know what to do
by exvinity2222 April 2, 2024
Get the national cum inside me daymug. Any party that profits from the practice of buying, selling or the referral of Real Estate property through having access to premarket or confidential information.
by Tessa Jo November 30, 2022
Get the Insider flippingmug.