Someone who has a particular set of skills at killing bucks that have the potential to be big bucks or records if they can grow past a button head buck with this person in the woods.
Guy1: I just killed my 3rd button head buck in a row!!!
Guy2: what a bb killer lol
Someone who bails on friends, possibly multiple times, when they want to see the hobbit because they have a massive pine cone in their twat.
Guy1&2: Wow, our newb of a friend bailed on the hobbit again.
Guy3: What a willbo!