The act of one who trolls (in various senses).

plural of trolling

(patent law, informal, derogatory) A company, person, etc., that owns and enforces patents in an aggressive and opportunistic manner, often with no intention of producing, marketing, or promoting the subjects of the patents.

(Internet) To respond to an individual who posts deliberately inflammatory or disruptive statements, such as to a newsgroup or other online forum.

(slang, Internet, of an Internet community) Not taking any steps to combat trolling.

(Internet slang) Someone who posts to an internet forum or newsgroup, claiming to share its goals while deliberately working against those goals, typically, by claiming "concern" about group plans to engage in productive activity, urging members instead to attempt some activity that would damage the group's credibility, or alternatively to give up on group projects entirely.

(transitive, intransitive) To troll as a concern troll would.

plural of troll plate

(engineering) A rotary disk with spiral ribs or grooves, by which several pieces, such as the jaws of a chuck, can be brought together or spread radially.

(transitive, intransitive) Alternative form of concern troll