Something two or more annoying people make up so they can exclude others.

When two or more of your friends randomly laugh at a word or phrase you said and you have no idea why and it confusess the hell out of you and when you go and try and find out they dont tell you because it's an "inside joke"

a joke only understood by an exclusive group of people.. usually they are used to annoy/leave out/embarrass/show off, to outsiders who don't undertand

An inside joke is a joke only understood and funny to only two or more people or a specific group. No one else other than that group will understand the joke and when they do, they will almost always not find it funny. They are usually jokes where "you had to be there" to even find it remotely funny.

A Joke that only a few people will ever get. Ever. Ousiders never find them funny once they're explained, because you had to bee there at the time.

Me and my bffs Meg, Rea, and Oceana (collectivley known as NEN have a lot of inside Jokes.

NOUN: Something for stupid people to post as their Facebook status, that they think is hilarious but truly sucks camel diyuk; sometimes followed by (U wudnt kno) or (INSIDER!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!)

A joke that's formed by two or more people. Normally it's just an excuse to laugh because those two or more people have little to no comedic value and they're probably the unfunny friend in a group who always tells jokes. Try to explain what an inside joke literally is and you'll find out you can't.

"Feathers on the bird"
"Ahahaha"
"What?"
"Feathers on a train xD"
"Yeah shut up"
Inside jokes are almost as annoying as little preppy girls spouting Jonas bros are sexy, I don't find any of them ever funny, I never have made one up, and people who do should be shot. (Might be extreme but it really is grueling)