One who intentionally posts on an internet forum to gain attention rather than contribute actual content. Some trolls may appear to contribute and may actually have meaningful posts, but the posts will be made in such a way that content is overlooked by design.
Common tactics include using an inflammatory or controversial avatar, unusual or different font, purposefully aggravating signatures. Trolls generally are not successful irl and rely on the attention received on forums to support their delicate self images.
OP : Do you think God loves us?
Forum troll post : Absolutely, I feel the love of God everyday.
SIG of Forum Troll : God likes fat chicks and smoking pole.