troll

1. An act of moving round; a repetition, a routine.
2. An act of fishing by using a running fishing line, or by trailing a line with bait or lures behind a boat.
3. A fishing line, bait, or lure used to fish in these ways.
4. An inflammatory or insincere statement posted in an attempt to lure others into combative argument (a flame war), originally a way for regulars (long-time users) to poke light-hearted fun at new posters (especially in Usenet newsgroups) and promote in-group cohesion ("trolling for newbies"). (figuratively)
5. A person who makes or posts inflammatory or insincere statements in an attempt to lure others into combative argument for purposes of personal entertainment or to manipulate their perception, especially in an online community or discussion.
6. A person who sows discord, or spreads misinformation or propaganda, in order to promote an agenda as part of an organized political campaign.
7. A company, person, etc., that owns and legally enforces copyrights, patents, trademarks, or other intellectual property rights in an aggressive and opportunistic manner, often with no intention of commercially exploiting the subjects of the rights. (informal)
8. A song the parts of which are sung in succession; a catch, a round.

Plural trolls