“Ix-nay on the ocolate-chay in the upboard-cay” is how you’d say “nix on the chocolate in the cupboard” in pig Latin. English speakers have a long history of inserting syllables or rearranging syllables in a word to keep outsiders from understanding. The pig in pig Latin may just refer to the idea of pig as an inferior, unclean animal. This is part of a complete episode.