troll
US /troʊl/
UK /troʊl/

1.
a mythical, mischievous, or grotesque creature, often depicted as living in caves or under bridges
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The children read a story about a friendly troll who lived in the forest.
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According to folklore, trolls turn to stone in sunlight.
2.
a person who makes a deliberately offensive or provocative online post to upset someone or elicit an angry response
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Don't feed the trolls; just ignore their hateful comments.
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He was banned from the forum for being a persistent troll.
1.
to make a deliberately offensive or provocative online post with the aim of upsetting someone or eliciting an angry response from them
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He likes to troll political forums with controversial opinions.
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Some people just want to troll and cause trouble online.