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Simply put, an inside joke with yourself. If you have to many of these, it is no longer a joke, its a mental condition.
Me: I was just climbing the tree and...

Classmate: HAHAHAHA!!!!!!

Me: Uhhh, dude, I haven't even got to the marginally funny part. What's the big deal?

Classmate: Oh nothing, just thought of something.

Me: Care to share?

Classmate: No not really, just an inside inside joke.

Me: I'm just going to move on then. So i was climbing the tree...


Me: Sigh.
by Ev003 October 09, 2011
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