e-bay bumping
When someone bids on eBay just to screw with the price and everyone else, not caring if they win or not. If they do win, the seller gives them the item back and gives them their money back, because the bumper is a sneaky little snot-nosed bully.
I bid $100 just to make you lose your mind.
You think you’re gonna win? Nope. I’m gonna make this auction go to $500.
I don’t care about the item. I care about making you pay for it.