This is a description of a gold farmer in the World of Warcraft. These are typically people from eastern regions such as Chinese or Koreans. It literally means happy farmer :)
Player1: I need to buy some gold.
Player2: Go to the keke Farmer's website then :)
Player1: Dude, this keke Farmer is stealing all my mobs with his hunter bot.
Player2: Report him to a GM and get his ass banned!