It's main purpose is to dismiss annoying arguments, people and situations in a civilized manner without resorting to flaming, net hooliganism or other kinds of embarrassing behaviour.
A way of saying "this little thing will not get me down".
The use of the "Fork Of Justice" ranges from literally using a fork to poke the offending party (in chat), posting a picture of a fork in a thread or blog, or as a comical over-played super hero roleplay.
"You have been poked with The Fork of Justice. Troll."