nigger
The word nigger is defined as the way a person lives, acts, talks, walks, smells, there demeanor, the shoes they wear, etc. Generally speaking, it's a lower class of person of there race of people, not just blacks. 
A white can be called a nigger living in a rundown house, painted in wildly bright color usually near or in the inner-city. Whereas a black can be called a redneck living in a home that's rundown, unpainted and typically not near or in the city. 

It is "a type" of person not necessarily black. Anyone can be called a nigger. AKA: sandnigger. 