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Gnarliside means that something is just SOOO gnarly that it can kill yourself.

A Conversion of Gnarly And Suicide
Guy 1: Dude! Did you hear about that guy that killed himself after bungee jumping out of a plane?

Guy 2: O, yea, i did. He made it OK, but it was so gnarly that he killed himself

Guy 1: Yea, he just committed Gnarliside!!
by Gnarlisideguy June 30, 2009
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