A person who resides in or hails from the USA or Canada. This term is only used by Canadians, who use it in order to feel like Canada and the US are part of the same thing while most US citizens tend to forget about Canada. Canadians use this term with total disregard for the fact that the continent of North America also includes the nations of Mexico, Belize, Nicaraugua, Costa Rica, Panama, etc. But the people who live in those countries aren't, you know, white.
LCD Soundsystem: "We are North American scum."
USA-type person: "So... You're Canadian, then?"