Here is the definition:
An Internet troll, or simply trolling in Internet slang, is someone who posts controversial, inflammatory, irrelevant or off-topic messages in an online community, such as an online discussion forum or chat room, with the primary intent of provoking other users into an emotional response[1] or to generally disrupt normal on-topic discussion.[2]
Here it usually means an anti trying to stir things up by posting controversial comments or baiting members. They always get a quick trip up ban avenue.