Grey's Anatomy is an American hospital-based drama series popular with those committed to celibacy.
In "The Ring", after being given Purity rings by the Jonas Brothers, Kenny McCormick and Tammy Warner attended a social gathering with other individuals who have purity rings. They stated that they love Grey's Anatomy and look forward to it all week.
Later at a shop, Kenny goes to purchase a DVD of the show, which Eric Cartman angrily takes off him. Trying to tempt Kenny with various sexual things such as Playboy to stop him acting so strangely after getting rings, but Kenny only responds when he is handed back his DVD.