1 definition by Amyy.xox
An inside joke is a joke, usually extremely silly and stupid, that you share with one or 2 other people. Only you and those people understand the joke; if the inside joke is explained to other people, they start to wonder if you are crazy because you find something so silly hilarious.
Katie: Are you aching for some bacon? Hahaha!
Jayne: What? That's not even funny!
Katie: It's an inside joke.
Jayne: What? That's not even funny!
Katie: It's an inside joke.
by Amyy.xox July 2, 2009