"Mandingo" and modern societal connotation

Factual Questions
1

I’ve looked around, but can’t find Mandingo in any context other than an African language and a word coupled with “hot interracial action” on porn sites.

I’ve gathered that the word implies a white woman’s desire to have sex with black men. Is this right? How did this come about? Can anyone elaborate on the phrase’s meaning and significance?

Thanks.

2

The novel (and later movie) by Kyle Onstott.

3

Can I gather that Mandingo (the movie) is bad-enough-to-be-cult, and so it’s become a cliche for more or less ironic reasons? My review searches indicate that it’s pretty terrible.