Trolling is a defiant behavior, insults and provocation on the Internet and not only. Trolling can be called any kind of behavior, designed to take someone out of themselves or just make fun of it. Usually those who are engaged in trolling, depicted in the form of sly grinning faces, nicknamed in the people "troll-face."
In these Internet sites, the art of trolling has been brought to a new, intergalactic level, thanks to the fact that it is difficult to give a troll to the muzzle on the Internet, and sometimes it is impossible to simply establish his identity. It remains only to insult and troll it in response, that is, "feed the troll".
And trolling is a kind of fishing, but that's another story.
Trolling is in the list: Slang