Troll - What does troll mean?

Troll is slang for "A person who posts offensive comments." See an example of how people use it.
A troll is a person who posts offensive comments to get a reaction. Trolls often live in forums and online chat sessions but may appear wherever there are Internet users.

Anyone Can Become a Troll

The Now: What is Trolling?

Troll Mythology, History & Types

Internet Troll Definition, Funny Troll Joke Essential T-Shirt for

Trolls of Norway—Facts and Fiction - Owlcation

How to Deal With Trolls - The Atlantic

A Guide to Trolling's Increasingly Elastic Definition -- New York

Troll, Myth and Folklore Wiki

Online trolling used to be funny, but now the term refers to

Have You Hugged a Troll Doll Lately? - The Strong National Museum

The Message of “Trolls” Is Not Unlike Atlas Shrugged