Actually, that makes you niggerish.... since we're all not niggers, we just act like we are.
The criteria for joining this club should be if you're BLACK and THINK you're White.
Niggerish- means you're white, but act like a nigger. "Acting Niggerishly"
Whereas,
Wiggerish - means you're black, but act like a white, "Acting Wiggerishly"