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Trade Trolls are the 'bullies' of WoW. The Term 'Trade Troll' was made up, considering most of the bullying in WoW happen in Trade chat.
'Trolling' is how some people refere to it, can get you suspended/banned, depending on what you say.
No one really likes trolls. They get on nerves, and usally make MORE trolls, which ends up in a few people leaving WoW.