"Miami Girl" is a commonly used phrase that refers to girl students who attend (or graduated from) Miami University in Oxford, Ohio. Miami of Ohio is known for not only outstanding education, beautiful campus, and epic parties, but also the reputation of the Miami Girl. Miami Girls are admired for somehow being able to look good even when making the "walk-of-shame" across Oxford, or going to class in sweat pants. Miami Girls are best known for being pretty, tan, well-dressed, and better than you. They can be marked by perfect hair, perfect teeth, perfect skin, and impeccable style.
"I starting dating this new girl."
"Yeah? Is she hot?"
"Dude, she's a Miami Girl."
"You're a lucky bastard."