Troll - A Derogatory term used for someone who "trolls" around on forums. It essentially refers to someone who comes into a thread without any knowledge of what's being discussed and throws an opinion in without reading back at all. It is VERY commonly misused and used to refer to anyone on a forum that someone doesn't like. It's use has become common when insulting someone, cause it's use invokes a mob mentality among forum users. When they here someone called a troll, they will almost immediately turn on that person and ridicule them until they leave the thread.
I personally DESPISE this term. Because it's primary use is one of negativity. Rather then teaching someone who comes into a thread, you call them this....
Especially since HALF the people on thos forum are just trolling around it, and not actually posting journals or reading something new to learn from...mostly it's long time users chatting with one another.