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 group of friends are walking around at the mall.
Girl 1: Trash can!!
(group bursts out in laughter except for one other girl)
Girl 2: why's that funny?
Group: Inside joke...
Girl 2: Okay then...
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