In online games, some people farm gold or valuable items within the game that they then sell on sites such as eBay.
Dumb people who are too lazy to actually play the game will buy these virtual items to give themselves an unfair advantage.
The word originated during a discussion on the World of Warcraft forums.
He's a durk, been buying all his gold and equipment off eBay. Dumb kid, don't know why he even bothers playing.