I'd see a troll as an individual who is purposely either:
a.) Using derogatory terms towards other individuals to either anger them or upset them.
or
b.) Acting like a complete idiot towards a subject to conjure guaranteed replies from other people, often in anger.
This is the closest definition apart from Scot's.
Trolling is acting in a certain way to provoke an argument or simply confuse the hell out of people.
Trolling is definitely not flaming; flaming is flat out insulting someone with the intention of making that person feel sad.
Edit: I think I need my Member Title should be "YUSOEDIT?"
Edited by James, 08 March 2012 - 03:08 PM.