A China-Nigger is a person that is 5'3 and is from asian descent. The reason for the term nigger to be included is because lil uzi is 5'3 and he is a nigger.
Afro-Americans tend to have coarser facial hair, and sometimes use special shaving tools to address this issue. "Nigger chin" is an offensive term for non-afro-americans who have similar, coarse, facial hair.
Bryan: "Man, my chin is killing me. It hurts when I shave it and makes me want to eat chitterlings."