It's a play on "RaFO" - Read and Find Out. I think it was from a Q&A with Brandon Sanderson before the last book came out.
Since it's a tv show, Rafe changed it to "WaFO" - Watch and Find Out. :)
Maybe he is trying to make the show more palatable for a modern audience.
I hope that's the case...Personally, I'm fine with polyamorous relationships, as long as everyone involved in it okay with it. It's not for me, but it's also not for me to judge. :look