ELI5: Explain Like I'm 5

Canuck

A Canuck is another word for a person from Canada. Canada is a country up north of the United States. It is very cold there a lot of the time, so people often wear warm coats and boots and have snowball fights. Canuck is just a fun nickname people came up with to call Canadians. It's like calling someone "buddy" or "friend" - it just means you're talking to a person from Canada.