A combination of random and OMG. It is to be used in situations situations in which one or the other doesn't quite so it justice, but when combined it provides the perfect description!
Person 1: "Something happened to me the other day but I can't decide whether to use the term 'random' or 'OMG'. Any help?"
Person 2: "Hell yeah! Just say randOMG!"
Person 1: "Oh yeah, that works! Well it was like so randOMG...."