noun: someone (usually of the opposite sex, but not always) whos number you have, but you don't really know them. May have met then once or twice(usually while intoxicated). May have never even met them at all. You call them when you are bored and need something to do.
Man, I'm bored lets call up some randoms on my phone.
That guys a random; got his number when I was wasted, but dont really know him.