2) When a swarm of trolls target a specific forum board or chat room and bombard it with messages.
3) A virtual ailment that affects the user by making them have the constant urge to troll people. Whether it be trolling stupid people or even other trolls, everyone could be your target. This disease is impossible to get rid of, but there are many so-called "remedies". It is believed to have first spread in 4chan, but its real origins are unknown.