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The state of being that results after an individual has become SUCH a heavy metal fan, that they lose their sense of reality. Their entire life becomes a "Metalfest" of just sitting in their apartment or parent's basement and headbanging to any form of heavy metal all day long.
"Hey, have you seen jake?"

"Nah, I think he was up all night watching Headbanger's Ball and listening to Rammstein."

"Damn man, that guy is just metally retarded."
by Nowherrmann April 14, 2008
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