and no it doesn't mean cool, it means insane, when surfers say "that was a narly wave" they are saying it was insane and diffucult not that it was cool. narly is a word used to evoke an amazement that is slightly negative.
a word used by surfing dude to describe things like waves or candy bars. also used to describe Brad by many people because he is reguarded as very hip.
When you're in a bummy a** recording studionodding off with thots and ignoring all your ANDROID phone calls because you're too strung out on dope to talk you're being narly and a fucking junkie.