Acronym for the "Super Uber Cool Online Awesomness game" Knight Online. Or can be used o describe someone that plays K.O. entirely too much.
Ex. 1 "I play K.O. all the time... and I have a girlfriend, doesnt that surprise you?"
Ex. 2 "K.O. plays K.O. all the time... and he has the hottest girlfriend on the planet... on the game atleast."