When I was still teaching, students would throw around their favourite slang, usually in proper ways. Gnarly was a favourite word of one of the young men I taught for five years.
A young woman used beast. The first time I heard her say that I was unsure what she meant, but it described her play as the Michael Jordan of her basketball league.
Mike photographed a tree and entitled the post Gnarly. It is cool which is what the young man meant when he used gnarly. It is cool there is wisdom in that tree as it does its work. It is also cool to find wisdom in the everyday world of words.