I was just making a joke. David Letterman, who I never watched, is alleged to have said it.
A guest speaker at our church had been to Peru. He was asked to dinner at the home of a poor old lady. He found out that dinner was her guinea pig. Sounded to me sort of like the hospitable gesture of “killing the fatted calf” for a visitor, like in the Bible. The guy was pretty humbled to realize she had used this valuable food source on him.