Anger and attention seeking, lashing out wildly

Definition of a troll from http://wilko.webzone.ru/troll.html

"Trolls" are people (or posts) that make use of a discussion forum
the
same way public bathroom walls are used by some for graffiti. These
posts are sometimes malicious and inflammatory, racist, sexist,
insulting - anything that can disrupt a discussion thread and turn
attention to the troll.