Someone who Bids huge amounts for an item on eBay with no intention of paying either for a joke or to end your item as it is competing with their's.
John: Did you hear about those AK47 £5 notes going on eBay for £80,000.
Joe: No one actually paid 80 grand for a £5 note, it was just bid trolls racking up the price for a laugh.
A friend or family member who posts immediately on your status updates with the desire to make you look like an idiot. They may well think they are doing you a favor, and they are. Showing everyone they are the true idiot
It is the territory of Trolls. Where every point less argument actually starts making a point. It's a nasty place not meant for the light hearted or people who can't take jokes.
+Do not enter terra troll.
+Shy guy Adam accidentally entered terra troll. He is much smarter now.