Crazier than Art Bell, Scientology, and the hobo who talks to himself combined.
Derived from the phrase 'lunatic fringe', the small social subset that believes in completely bizarre concepts. Off the fringe is beyond this.
To do something totally balls-to-the-wall mad that will likely get you killed is to 'go off the fringe'
'Man, those monks who set themselves on fire in Tianamen square were off the fringe!'

Steve went extreme masturbating yesterday. He jumped from a plane nude with a gallon of ky while listening to thrash metal and thought about gorillas in vinyl catsuits. That stuff is off the fringe.
by Apoth October 29, 2007
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