A person who does precision guess work based on unreliable data solving problems you didn't know you had. Normally very strong for there size and most have a bad temper so best not to mess with unless you are a tree climber. Usually addicted to hard drugs like painkillers and meth but often just weed and alcohol. Often has no driver's license or bank account. Expects to make half of the income generated by the company he works for.
Also see logger and ground worker, Tree man, Tree guy.
"Hey do you know that drunk guy over there?..
Yeah, that's Bill. He's a bad ass for sure. I wouldn't f**ck with him, he's a Tree Climber."