I just say "2012", it seems to reach most idiots, and if it doesn't I just mention the words "New age" and/or "Mayans" that works.
See, the same people who think people talk to the dead, but never ask what religion they are in, show their ignorance (or that they fake it). So when I hear "doom", I don't worry, it's a word attached to fools that have long outlived their own prophecies.
I know that had nothing to do with the OP, but it was fun to say.
Not to mention "doom" is always expressed better as;
That is not dead which can eternal lie,
And with strange aeons even death may die.
Now that is doom and gloom, the rest is just amateur............