User blog comment:Shadowunleashed13/You Can Do Anything: Reject Riot 5/@comment-4533965-20131112233310/@comment-5215338-20131114013822

Full Definition of GNARLY: (from Merriam-Webster) slang

A: difficult, hairy  B: bad, nasty  C: cool, good

Now I'm confused on what you mean because the definition contradicts itself. :S