The superlative form of 'gnarly,' meaning most twisted and knotted, or in slang, most extreme or most impressive.
From the adjective 'gnarly' plus the superlative suffix '-est,' creating the highest-degree comparison form for describing the most gnarled things.
Using 'gnarliest' as slang for the most awesome or extreme trick captures how extreme sports culture takes descriptive words and transforms them through metaphor—turning wood's imperfections into badges of honor.
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