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1.
something that exceeds normal words to describe it. it is more epic than sick, sicknasty, sickgnar, tight, and other adjectives.

may refer to snowboarding
Dude 1: Dude i can't believe it's snowed 420 inches in the last week! We're gonna have some sickgnarsty snowboarding this weekend!

Dude 2: Like a boss.
by jeremice March 08, 2011