when a tv show begins going off the deep end like the CW teen drama, Riverdale. It usually happens in a show’s later seasons. This happens through the introduction of wild or outlandish plot lines that mess with continuity in the overarching story. Riverdaling happens when these storylines are integrated with no foreshadowing or basis.
person 1: "Hey a friend told me you're obsessed with Riverdale, It's the best show in the world!"
person 2: "Nah. I don't think of it as a show if not a religion. It's called Riverdalism."