Oprah Winfrey in racial slur

Oprah Winfrey, 59

Oprah's former co-star in the 1985 movie "Colour Purple" Rae Dawn Chong,  has taken a foul-mouthed racial dig at the business mogul. Rae whose mother is Afro-Canadian and featured alongside Arnold Schwarzenegger in the hit movie "Commando" claims Oprah is a self-centered fat "b***h"  who would have been a "house n**ger" back in the slave days. 

Rae Dawn Chong, 52

She went further and says Oprah was "lovely" to her back on the set of Purple in 1985 ... but when she moved on to her next movie, "Commando," that's when she says Oprah became "a total biotch."

"I starred in Commando. And she just wasn’t having me. She’s competitive. She didn’t like me. She just wasn’t having me."

It's clear, Rae doesn't like Oprah either -- 'cause for the next several minutes of the interview, she ranted on and on about how much she hates Winfrey -- and stooped so low, she even took shots at her appearance and invoked slave imagery. 
"If you look at the way [Oprah] looks, she looks like 60 years ago she would have been a house keeper luckily. She would have not been a house n**ger she would have been a field n**ger."

RDC continued the attack for several minutes. Among the lowlights: 

-- "Shes so enormously insecure. If you wanna distill Oprah Winfrey down to like her most basic components. She wants to be beautiful."

-- "Imagine being [Oprah]. She has all of the world. All the power in the world ... and she only wants something that is only chemical, purely impossible."

-- "The thing that’s really great about Oprah that you cant take away from her is that she's a great brown-noser."

Rae concluded the interview with a compliment wrapped in yet another pitiful attack -- "No matter how vile she is, you kinda gotta go, 'hello hats off' like, you’ve done an amazing thing you have actually shifted the DNA of the universe."

TMZ.COM