A despicable person on a message board that deliberately tries to get everyone pissed off. Usually, they write in capital letters and make outrageous topics to get a rise out of everyone. Many times, trolls will be regulars but cannot be identified because they make new Screen Names, usually these new Screen Names are named after the topic they're trolling about. Either way, trolls should never be responded too, because theyll just use insults or useless arguments, and you'll never win by arguing with a troll.
Don't ever feed the trolls on a message board.