Top Definition
The theory that every exit you make is an entrance somewhere else.
Grasshopper: Dad, do you mean that if I hop through this door; not only am I exiting this room, I am entering this other room at the same time.

Dad grasshopper: Yes grasshopper, you are getting wise young one. Actually there is no such thing as a singular exit or entrance. They are one and the same thing.

Grasshopper: oh

Dad grasshopper: Don't think about exitheory too much, your prothorax will explode.
by Exitheory September 16, 2008
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