Are not actually random in the slightest.
If they drank petrol on a night out, wore medieval attire and shit upside down then I'd agree that they are random but simply saying a silly word for other peoples benefit does not make you random.
This 'Randomness' tends to be a female thing, as I have heard a number of girls refer to themselves as this. Coincidentally these girls are pretty much clones of eachother.
They are slowly changing the meaning of random into 'I'm an uncreative shitbag."