In volume 36 of the fairly entertaining Sandman written by Neil Gaiman, George calls Barbara and Wanda "the princess and the queen". Wanda appears to not take kindly to it.
Wanda: What's so funny, George?
George: You're the princess and the queen. Heeheehee. Get it? Uh the princess and the uh queen. Heehee.
Wanda: You know, death really hasn't improved you one little bit, George.
So, what is the joke about?
I tried googling this, but whatever meaning this idiom had before GRRM's eponymous novella, it's lost to history now.