Top Definition
The place you are when your mind has been altered by sleep deprivation or drugs to the point where you philosophize ad nauseum.

I used to use this word when I stayed up with my best friend until 3AM camping. It always seemed like in that tent we would figure out how the whole universe worked.
Wow that was totally deep, I think I have entered the psychosphere!
by Sabrnig March 16, 2010
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