The definition of a psycho is slang for a crazy or insane person. Psycho is defined as mind or mental.
Oxford dictionary defines them Insane, Webster- mentally ill
Cambridge- crazy, frightening, Others- mentally unstable
Without Einstein, Galileo, Newton n others..
What would the world be, not as advanced without thee...
Normal soul don't progress, all they do is rest and eat...!
Also if one prefers being an Artist or an Activist, who is not interested in earning too much, PSYCHO you shall be called by the Business Community, especially if their own daughter, wife or daughter in law pursues it. Time is money for them. If you are giving your time and not earning out of it, then you are a Psycho!
Enjoy!