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A thunder bearian is someone who was born and raised in Thunder Bay ON, Canada and can survive -40 with windchill in the winter. They also dont give a shit about what anyone says about them.

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Man at the bar last night this guy was being such a thunder bearian that he actually made us sit in the car for 45 mins while he kept lighting joints and it was -37 out!
by True Thunder Bearian February 03, 2010
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