In internet slang, a troll is a person who posts inflammatory, insincere, digressive, extraneous, or off-topic messages in an online community (such as social media (Twitter, Facebook, Instagram, etc.), a newsgroup, forum, chat room, or blog), with the intent of provoking readers into displaying emotional responses, or manipulating others' perception. This is typically for the troll's amusement, or to achieve a specific result such as disrupting a rival's online activities or manipulating a political process. Even so, Internet trolling can also be defined as purposefully causing confusion or harm to other users online, for no reason at all
https://en.wikipedia.org/wiki/Internet_troll
As Res Ipsa has already pointed out, the regulars on this forum have interacted with each other for more than a decade on a regular basis. We know who the posters are here, and I cannot think of a single poster who fits that definition aside from the two morons who just joined. The closest thing we had to a troll was a poster named subgenius, but he left when the board switched over domains. Ajax isn't a troll usually, but he turns into one whenever he starts a thread and it is immediately shown that he's been dishonest.