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1.
USAn - A person with residence/roots in The United States of America.

Not to be confused with:

American - A person with residence/roots in one or more of dozens of countries in North, South, and Central America.
I've lived in Minnesota all my life. Therefore, I am USAn. You've lived in Ecuador all your life. Therefore, you are Ecuadorian. But we are both American!
by Maddie Jacobs April 16, 2008
 
2.
Pronounced "You-ass-en." A derogatory term used to describe the citizenry of the US.
How the hell could the god-damned US'ans be stupid enough to elect that asshole Bush--twice??!!!
by Max Moriarty June 26, 2005