Did you here about the family of coons that moved into the nice lilly white neighborhood? It won't be long before it becomes niggerized, there will garbage over the yard, windows broken out, a 55 gallon drum (grill) in the drive. There goes the neighborhood!
When being any race that has no relation to being African, that a person is being converted to the african american culture of a nigger, which the action would be "niggerized".
niggered up (adjective); nigger it up (verb) ; a condition in which something that would normally look just fine now looks not so nice usually because of unnecessary additions or messiness
Mom: Our house looked beautiful until Anthony got it all niggered up with all of his cords and shit.