A Scouser is someone from the city of Liverpool in England. People from Liverpool use it about themselves, and people from other places use it too. It is informal and usually friendly, though — like many names for people from a city — it can sound sharp if someone says it with a sneer. You will hear it far more in British English than in American English. Though actually, not every person born in Liverpool loves the label, and some use Liverpudlian instead when they want a more neutral word. Scouser is built from Scouse (the Liverpool way of speaking, and originally a local stew) plus -er, the ending that often means “a person linked to that thing or place.”

利物浦人（口語）