An Internet troll, or simply troll in Internet slang, is someone who posts controversial, inflammatory, irrelevant or off-topic messages in an online community, such as an online discussion forum or chat room, with the primary intent of provoking other users into an emotional response or to generally disrupt normal on-topic discussion.

A mythological internet being that lives under an internet bridge. Loves to hunt for innocent netizens.

Common tactics: antagonizing other netizens by posting racist or offensive comments
Weakness: being outwitted or unable to antagonize others

A person whose sole purpose in life is to seek out people to argue with on the internet over extremely trivial issues. Such arguments can happen on blogs, Facebook, Myspace and a host of others.
The best thing you can do to fight an internet troll is to not answer..or report them.

A person who posts remarks or comments onto internet forums or message boards in an attempt to get someone to comment negatively to it and to redirect attention onto himself. Usually, these remarks are controversial, stupid, off-topic, inflaming, illogical, or childish. Sometimes, the comments are enough to enrage the people in the forum to want to respond back with their own negative remarks which starts a flame war and changes the topic and attention of the discussion. Since, internet trolls are attention whores, this is exactly what they want since they probably don't get enough attention in real life and needs someone else to acknowledge their self-worth and existence. Nowadays, they are commonly found infesting internet forums and websites such as the GameFAQS Message Boards, youtube (most notably in the comments section), moviecodec, rpgcodex and many others. It is best to ignore them unless you want flame wars to engulf the forum.

A person who gets a joy out of reactions, but dur to how bad it has gotten. Now can be considered a felony possibly to a terrorist charge soon near the future. Internet Trolls enjoy causing drama by using certain facts that are cherry picked to get negative reactions, gaslight when called or play ignorant, mainly manipulate easy targets such as mentally handicap individuals to commit serious felonies or crimes and then use them as scape goats to bait them and cause real life problems.

Lack any empathy what so ever and will commit defamation against anyone they don't like or for shits an giggles out of pure malice. Mainly targeting furries, otakus, innocent people, businesses, social platforms that are public, political parties, etc. They also admit to actual crimes and are selectively prejudice.

These individuals are usually in their 20s to 30s doing this messed garbage. They also love to manipulate people in power to abuse very popular and well known platforms just so they don't have to suffer consequences. To make those who they don't to suffer for their personal disgusting amusement. Also willing to go as far as to create false or forged information or to use topics they cherry pick or edit to cause serious problems for everyone. Internet trolls also may or possibly possess illegal content to use to defame people or for their own sick twisted pleasure.

Freaking assholes who try to piss you off on places like YouTube vids and such, they're really annoying and will keep you going back and forth for HOURS!

A person who feeds off the anger of others as he enrages them over the internet.

Someone who is jobless and has no friends causing drama by arguing with people without wanting or accepting anyone's response, also known as a "James"

Someone who causes dismay to someone on the internet that they don't even know, much less befrended on a site. They are most likely known to put lame or hurtful comments on someone's facebook, YouTube video (mainly videos in which the user is attempting something new like animation or clay mation), or anywhere you can openly post comments. Internet Trolls are known to also have nver contributed to the site they terrorize on and have a lame username. The best way to control the troll is to post a hurtful comment back or just delete, mark as spam, or report the comment.