It was “nigga.” I remember how shocked I was to hear it ftom her.
You are correct the overdub was “chump.” But that was not the original.
I disagree. I saw it in the theaters in the first couple of weeks that it came out in 1980 (we had a friend who was such a movie buff, he dragged us to every new film). It’s always been “chump”. Granted, this was Texas so perhaps the phrase (which is off camera) was redubbed after first release but the n-word was not to be uttered (by cultured whites, anyway) even back then.
Now, the scene in “Mad Men” where Mrs. Blankenship disses the Clay-Liston fight, she really does say the n-word but the DVD release changed it to “negroes”. Her shocking line was “If I want to see two n-——s fight, I’ll just throw a dollar out my back window”. Classic.