Kiss my fucking ass! This is an acronym that can be used either as in insult or in a sarcastic manner between friends. Generally considered to be a very vulgar term to be used in only the worst case scenarios like during on-line multi-player games.
"kmao", The term for laughing so hard you're genitals fall off, "kmao". The year is 6969, the strange word "Lmao" is now lost, humanity only remembers "Kmao", an accident, something that was never meant to be.
Subject a: (dies 10 times in game, rage quits)
Subject B: Haha kmao, so bad