Annoying no-lifes who monitor eBay auctions all day before placing a bid at the very last second to prevent anyone else from getting the item, causing frustration and despair to failed bidders.
"YES, 5 seconds to go and that laptop is mine! All for £50!"
"What the shit? Bitch! Some bastard eBay sniper sniped me at the last second!"
To be a successful eBay sniper, enter the very maximum you are willing to pay when the auction has less than 10 seconds to go. Then imagine the faces on those lowballers you just beat.
Sarah: Wow Mike, how do you manage to get so many great deals on eBay?
Mike: I'm an eBay sniper!
The act of fooling an ebay sniper by being ready with your own bid, ready and set with your mouse right on 'bid'. As soon as the sniper bids, you bid right after and fool them. They will most likely get pissed and proceed to bash their face on the keyboard.
I'm ready for the ebay snipers. I've got my bid already created, all I have to do is click the button to place it. *Sniper attacks 2 seconds before the end of the auction* I click the bid button a second before the end, fooling the sniper. Oh yeah, eBay Counter Snipe!!
Other guy gets pissed and breaks his keyboard whilst smashing his head against it. "Damn counter snipers!"