D.Khánh
A person who gets an 8.5 or higher in English when taking the exam for high school. They're like the kings of grammar and vocabulary.
I got an 8.5 in English. I'm a D. Khánh now.
That kid got an 8.5 in English. He's a D. Khánh. I'm just a peasant.
I'm a D. Khánh. I got 8.5. My cousin got 9. He's a D. Khánh too, but a better one.