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someone who rips, on anytype of board shaped vehicle, ie: Longboard, snowboard.
did you see all dem gnar-shredders rip through the pow lines.
by James Cash Barrett March 17, 2008
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anybody who does anything and does it well or a person who smokes a plethora of marijuana.
Wow! Do you see that guy out there riding the waves?--- Yeah, he's a real gnar shredder. or
He smokes entirely too much kush..--- Oh yeah, he's a textbook gnar shredder.

by sandsdatboy August 30, 2008
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