A person that is someone that is either original, cool, awesome, exhibits african american like qualities, or a combination of those
Kurt: why is that guy getting laid and we aren't?
Kai: Cuz he is so nigga fresh
A "fresh" looking nigger, similar to saying someone looks "sharp" but used in reference to a nigga. Usually when a nigga is going to the club and is all cleaned up.
"Damn son! You nigga fresh!"