Refers hyperbolically to some sudden or unexpected deviation from what is familiar or customary. Well, whoever is elected, it won't be the end of the world as we know it; each candidate is as good or bad as the other in my book.
the end of the world as we know it
and TEOTWAWKI
phr. & comp. abb. said to emphasize that things change, often a lot. Yes, you have to buy the operating system separately. It’s TEOTWAWKI.