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

by Goat (real meaning) July 3, 2021

A Liam Joke is a joke that is intended to be funny, but is rather painfully unfunny and beyond generic. The origin of the phrase “Liam Joke” comes from Liam Griffiths (Born January 13, 1999) who constantly uses the joke “Guess what? Chicken butt” when interacting with his family.
PlayerColton2k: Guess what?
Big B: What?
PlayerColton2k: Chicken butt
Big B: Wow, I’m pissing my pants so hard. You just told a Liam Joke.
PlayerColton2k: What’s a Liam Joke?
Big B: A joke that’s not funny.
Big B: What?
PlayerColton2k: Chicken butt
Big B: Wow, I’m pissing my pants so hard. You just told a Liam Joke.
PlayerColton2k: What’s a Liam Joke?
Big B: A joke that’s not funny.
by mrberenisp4d0 May 22, 2025

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

by Aerothermoelasticity March 15, 2021

*orders a 12” inch subway and when it arrives it’s 10”*
Liam: you’ve got to be jimmy joking me, this is taking the piss
Liam: you’ve got to be jimmy joking me, this is taking the piss
by dickheadan May 6, 2018
