Is "meatloaf" a common recipe in the United States? Because I saw that many American TV series are mentioning "meatloaf" during the show, like Batman TAS or The Simpsons.
Meatloaf is a recipe that originates in Scandinavia and Europe. It contains ground meat and other ingredients which is baked into the shape of a bread loaf. It used to be a very common dish in the United States but it is not super common anymore. It is generally a dish that is made among the older generation today.