Of course, I did. I mean, who the hell comes up with such a thing?
Apparently, a man by the name of John Martello, a Furry artist who really likes dragons.
It's reported he created the first three images back in 2004, why is still kind of a mystery, though it is believed they were created for some sexual fetish purpose. The three images were eventually reposted on the Oekaki Board, a site where artists share their images. The board created talk, wondering if there were really people in the world with a Dragons Fucking Cars fetish.
It's assumed that Martello saw this discussion and in 2007 created two more drawings that found their way online.
In recent years, it has become a full blown MEME, thanks to Reddit.
This is the cleanest, and least entertaining, of Martello's drawings. You can find more at the Reddit link above, or by simply googling "Dragons fucking cars".