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.
Jackie: Did you see that movie Forgetting Sarah Marshall?
Mark: Yes! Remember that part where...
Jess: Yeah when Peter's all upset and...
Andre: *laughs* I loved that movie.
GROUP: *starts singing Dracula's Lament*
Jackie: Guys, this movie is totally becoming our outside joke.
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