What does being called "TROLL" mean? ?

Internet trolls are people who create problems for others on different sites while contributing nothing positive. There are many on Yahoo Answers, they report extremely small violations, which in many cases aren't even violations; they also give "thumbs down" constantly often with no valid reason. Because of trolls, to protect yourself, if you haven't done so already, you may find it best to edit your info to keep your questions and answers hidden that makes it tougher them to stalk you around the site. You can also change your avatar and i.d.or post in other than your usual categories. Trolls often hang out at controversial sections such as religion, homosexuality and polls, when someone posts what they disagree with, they report them.

http://en.wikipedia.org/wiki/Troll_(Internet)

According to yahoo: A "troll" is someone who intentionally and persistently posts inflammatory messages about sensitive topics to bait users into responding or provoke a confrontation. We also consider people to be trolls when they persistently misuse product features such as the ratings system to negatively target others.

Someone who purposely starts conflict. Basically a fantasy land word for an instigator.

Example - going to a porn community site and spreading the word of god or posting porn on christian forums.

Or seeing someone talking about cats and interrupting with - get a dog.

Basically being dickish for self satisfaction. Its mainly a internet thing so it gets a internet word. It does happen in reality just far less because the consequences are there.

A troll is someone who says certain things on purpose to get people angry and or irritated.

Spamming

Pretty much... Look at http://artoftrolling.memebase.com/

Thats where you can see what "trolls" do and how to not be accused as one.

Obvious troll is troll.

trololololol