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1.
1. The highest level of craziness.

2. An uncontrolablly insane person. Things they do/say are beyond any comprehension.
Lisa loves Josh like a psychomaniac.
by asil June 10, 2007
 
2.
characterized by excessively neurotic and psychopathic behavior. Symptoms often include random bouts of yelling at random passersby, violent drunken outbursts, and splitting headaches that leave their victim bedridden for days or even weeks at a time.
Damn that psychomaniac Mike Gilson has huge lat muscles. Are those things bat wings or what?
by Daniel P. Murphy May 09, 2008