Trolling - What does trolling mean?

Trolling is slang for "Posting offensive comments." See an example of how people use it.
A term that stands for the act of posting offensive or inflammatory comments to invoke some kind of reaction; often includes statements that are false yet sneaky so that people believe them.

Trolls, Roblox Wiki

Trolling, Banter, Cyber Hate, Online Bullying Umar Anwar, Kevin Timpati, Phinephas Asare, Will Donaghy, Thomas Lam, Chris Ankle, Matthew Tierney. - ppt download

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Online trolling used to be funny, but now the term refers to something far more sinister