n. A casserole composed of low-grade ground beef, onions, crushed tomatoes, tomato sauce, and pasta, common in Ohio elementary school cafeterias. The most vile substance ever served for lunch. Trivially easy to prepare, and cheap to make it is a favorite of school administrators.
My first experience with johnny marzetti was also my last. After that, I had my mom pack my lunch for me (in a Star Wars lunchbox).