PushButton Nigger. Someone that tells you to do things for them, and you do them. Until they start expecting you to do these things. That makes you their P.B.N.
Sue: Go to store, and on your way out turn off the light and change the channel on the tv.
You: ok, no problem
Sue: When you get back, you can make my bed, do the dishes and fold the laundry.
You: Come on Sue, I'm not your P.B.N.! Do something yourself!