There are no princesses in the real world. A Dragon Slayer is a dignified position where one braves the real world and confronts people about irrationality of incoherent world views and delusions completely unafraid of the repercussions of pissing people the fuck off.
a: Dude, that guy just blew up that street preacher. I know that pastor too, he has a PHD.
b: Ya, he was a total dragon slayer.