I was also curious. Found this explanation: https://www.liverpoolmuseums.org.uk/stories/best-scouse-recipe
A stew often made with lamb, beef, or both, it originates from the word 'lobscouse', which was a stew often eaten by sailors throughout Northern Europe, popular in port cities such as Liverpool. By association, Liverpudlians are known as Scousers, and many have their own special recipes for this delicious Liverpool staple.
That's one way to shut someone up, lol