A combination of the words "under," "stand," and "that." It is commonly used in military training environments, on the streets (primarily the hood), and Louisiana.
An asian who sprints in the hallways of school so they can be the first one to class. You will normally see them going up and down stairs really fast. Good luck catching them.
Instead of referring to them as American, since America is made up of two (or one continent depending on a country's continent model) continents: North America, which ends at the isthmus of Panama. And South America, which starts in Punta Gallinas, Colombia.
Everyone from the Americas is American, just like everyone from any country in Europe is European. Therefore, the term "USAsian" is more specific to people from the United States.
Alex: Cool, me too! What part? I'm from Mexico.
John: Oh, I meant, I'm from America, as in The United States.
Alyssa: America is the entire continent, silly. I'm from Canada, so we're ALL American. You're USAsian.
We hold these truths to be self-evident, that all beings (not birds) are created equal, that they are endowed by their Creator with certain unavian-able Rights, that among these are Featherlessness, Flightlessness, and denseness of the skeletal structure.