When an inside joke spreads to so many people’s understanding and it becomes no longer exclusive.

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.

From amusing to terrifying, outside jokes incisively reveal a speaker's deficiency and usually highlight their gifuckingnormous douchebaggery. While different eras would have forgiven or simply forgotten such excretory gems (you can't make this shit up), the rise of internet blogging, cutesy Daily Show quips and a President who planned 9/11 in alliance with Israel (see this is an outside joke!), The oughts became larded with pathetic irony purveyors. Though we may have left the golden age (or festering shit swamp) of outside jokes, examples are available anytime Barack Obama expresses outrage, a college student describes themselves as spiritual but not religious, or when a middle aged basketball scout salivates over a nineteen year old "physical specimen".

A joke that is only funny to parties that are not involved in the joke, but is depressing, frustrating, or simply not funny to parties that are involved in the joke. It is essentially the opposite of an inside joke.

An outside joke is actually an inside joke, the difference being this: an insider is shared between a few close friends, and an outside joke (also referred to as outsider) is shared among a public amount of people, based on a video posted on YouTube, a celebrity's fanpage on Facebook, a funny line from Family Guy, etc.

The opposite of an inside joke everyone knows it and it is not funny at all.