Earlier quoted context omitted.
It's a term people use to either be funny, or it's because they're somehow offended that people from USA use the demonym "American" even though there are other countries in the Americas, yet despite the fact that no one else in those countries seems to care because they have their own demonyms they use. The former are just having a laugh, and the latter are looking for things to be offended by. I don't know which cam…
I prefer Youessians.
Youessish. Like in British, English, Irish, Welsh, Scottish.
Youessan. Like in Mexican, Puerto Rican, Cuban.
Youessese. Asian American.
Youessian. Like Italian, Hungarian, Russian, Indian.