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1.
The smallest, most basic unit of thought, analogous to the atom in matter. From "Gulf" by Robert A. Heinlein (in _Assignment in Eternity_)
The fastest possible rate of thought is one psychon per chronon.
by TANSTAAFL1 September 21, 2012
 
2.
A person who is as crazy as a psycho and as ugly as a cyclops.
Nick: "You're a psychon."
Ali: "What's a psychon?"
Nick: "Look in the mirror, Ali."
by freshmelvinzzz December 16, 2011