A term used for those who are insane and extremely skilled at something others do not know about. derives from the term "blackhat" meaning skilled or awesome. and "Zane" either used as an insanatory expression such as "Zany" or the name Zane.
John: dude I fucking hate Harold. Hes extremely insane.
Matt: Apperiently hes amazing at guitar though! Can you beleive that?