Urban Inside Joke 

A word or term submitted by people on Urban Dictionary that usually revolves around a person or thing that very few people other than the submitter actually know about, with said word or term often having a definition that does not accurately or effectively explain what it actually is to people who have never heard of such a thing before

The huge amount of urban inside jokes is fucking irritating.

Urban Inside Joke by Unrealistic Trap-like Pervboi February 1, 2018