Where's this phrase from?

Just trying to figure out where this saying comes from, as I heard it in a couple of places within short succession and was intrigued about its origin.

The saying is "apres moi le déluge" (not sure if the spelling is right there) and from what I gather it means "after me comes the flood/deluge".
I heard it first in a Regina Spektor song (called Apres Moi) but then heard it again in an old Only Fools and Horses episode (one of the common sayings that Del Boy uses in the wrong context etc.).

After a bit of googling, it seems to be an oft-spoken phrase, but I'm trying to find out where it comes from, where it was used first and what context it's meant to be used in.

Thanks for any help!