You can also say 'random guy', 'random girl' etc.
-- "I dunno, just a random who followed us in off the street, I think. He slept in the shed."
"I didn't really know anybody there so I was just chatting to randoms all night."
Often used by an MTVeenager.
Another Uni Student: "Wow that's soooo RANDOM! Let's go and buy some trendy clothes which have meaningless and pretentious words/numbers all over to make us look random."
Me: *clobbers with garden rake*
jon: "i was walking to the olive garden today and i saw some guy with a top hat pop out of the sewer and he told me he was a rainbow six agent on a misson from Kibdue god of steel mugs so i told him exactly my deductions from the cherry tree last sunday"
This is correct because nobody can predict exactly when the atom will decay. It actually doesn't follow a pattern.
Incorrect: Lol! Here r sum randome people I just met.
This is incorrect because the people have been chosen by a number of criteria: they are people that happen to be closeby and people who are willing to talk to you.
Incorrect: LoL here R sum randome words that I am thinking of.
The words are not random because you have specifically chosen them on the criteria that they are "suprirsing" or "unusual".
Bob: Window cleaners for British rail should watch out for flying man-eating deckchairs today, swimming in from the south along with the flea-ridden coathangers. The calf needs the blinds shut due to his purple parrot problem, and the pet washing line needs a slap round the face for dropping the flying monkey on the "queen of the night" tulips. The muffin man is responsible for the sudden outburst of rain yesterday as he forgot to pay the rent on his blue strawberries. I'm sorry, did you say you wanted a biscuit?
Holly: Random! Custard cream please.