trolling
It is a fishing term. The fisherman trolls by dragging bait behind the boat. In this way, a person on the internet trolls for strong responses by posting something outlandish (the bait).
In recent years, some have mistaken the use of the verb "to troll" with the noun "troll" as in a mythical, unpleasant creature. They are not the same. A person on the internet who trolls is a troller, not a troll, but the post can be called a troll.
troll1 (trl)
v. trolled, troll�ing, trolls
v. tr.
To fish for by trailing a baited line from behind a slowly moving boat.
To fish in by trailing a baited line: troll the lake for bass.
To trail (a baited line) in fishing.
Slang. To patrol (an area) in search for someone or something: � [Criminals] troll bus stations for young runaways� (Pete Axthelm).
Music.
To sing in succession the parts of (a round, for example).
To sing heartily: troll a carol.
To roll or revolve.
v. intr.
To fish by trailing a line, as from a moving boat.
To wander about; ramble.
Slang. To patrol an area in search for someone or something.
Music. To sing heartily or gaily.
To roll or spin around.
n.
The act of trolling for fish.
A lure, such as a spoon or spinner, that is used for trolling.
Music. A vocal composition in successive parts; a round.
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[Middle English trollen, to wander about, from Old French troller, of Germanic origin.]
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troller n.