What's the definition of trolling?

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troll noun (1)
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\ ˈtrōl \
Definition of troll (Entry 1 of 3)
: a dwarf or giant in Scandinavian folklore inhabiting caves or hills
troll verb
trolled; trolling; trolls
Definition of troll (Entry 2 of 3)
transitive verb

1a: to fish for by trolling
b: to fish by trolling in
troll lakes
c: to pull through the water in trolling
troll a lure
d: to search in or at
trolls flea markets for bargains
also : PROWL
troll nightclubs
2a: to antagonize (others) online by deliberately posting inflammatory, irrelevant, or offensive comments or other disruptive content
… trolls engage in the most outrageous and offensive behaviors possible—all the better to troll you with.
— Whitney Phillips
b: to act as a troll (see TROLL entry 3 sense 2) on (a forum, site, etc.)
… is also notorious, for trolling message boards on the Internet, posting offensive material he himself has written and then suing anyone who responds in agreement.
— Mark Hemingway
c: to harass, criticize, or antagonize (someone) especially by provocatively disparaging or mocking public statements, postings, or acts
The switch came after the Chargers became the butt of jokes, memes and derision on social media. The NFL tweeted the initial logo Thursday, but later deleted it as the Chargers even got trolled by other pro and college sports teams over the logo that looked like a cross between baseball's Dodgers and hockey's Lightning.
— Arnie Stapleton
But [Niki] Caro told The Los Angeles Times this week that there might be music after all. Caro said she got trolled by fans because of the rumor of a lack of music.
— Herb Scribner
The club has been trolled in a brutal (and somewhat brilliant) manner—by having a giant poster of Tevez scoring his last-day winner plastered outside their Bramall Lane ground.
— Will Magee
3: to cause to move round and round : ROLL
4a: to sing the parts of (something, such as a round or catch) in succession
b: to sing loudly
c: to celebra