Black woman that likes to fuck white men. From the days of slavery where the captain of the slave-ship would keep a black woman in his cabin for sex, in exchange she gets the luxury of not being treated like the rest of the slaves.
Same thing for the slave women kept in the owners home for sex rather than housework. They start to develop a sense of self-importance and higher status compared to the rest of the slaves.
S1: I ain't seen Betty for a few days. I hope she's OK.
S2: OK? She's the Master's new coontang. She been bossing the ladies upstairs around like she the new mistress.