"Butter Off Dead" is an episode of The Itchy & Scratchy Show.
In an agricultural setting (probably in a Mennonite society) Itchy has run out of butter. As farmer Scratchy visits farmer Itchy (both of them are dressed like Scottish mans, complete with beards), Itchy shoves Scratchy into a cow's mouth, and an inside view of the cow shows Scratchy being digested by its four stomachs. Itchy then milks the digested Scratchy out of the cow and pours the milk into a butter churn to create his own "I Can't Believe It's Not Scratchy!" butter. When he spreads this on his toast, Scratchy's eyeballs are seen, and after saying a quick prayer Itchy chomps down on the toast.
This episode was shown at a college class that Tina, Carrie, and Lisa attended, with the professor asking what the episode meant.