Ameropean
An American who spends a lot of time in Europe and often longs for the European lifestyle when they are home in America.
I spent a year in Europe studying for my Master's degree and now consider myself an Ameropean returning to Europe every 6 months to visit.
Ameropean
An American who was either born an expat in Europe and grew up there as a dual national, or born in America and raised there, or one who has lived there for as long or longer than s/he lived in the States. Probably speaks at least three languages without an accent, like a local.
Ameropeans tend to have a broader world view than normal Americans, and can adapt faster to new cultures.