The Apartheid Law was also hysterical gibberish. It defined a white person as "A White person is one who is in appearance obviously white – and not generally accepted as Coloured – or who is generally accepted as White – and is not obviously Non-White, provided that a person shall not be classified as a White person if one of his natural parents has been classified as a Coloured person or a Bantu."

Clear as mud? Good.

Government boards tasked with classifying mixed-race (or suspected mixed race) people looked at things like your job (i.e. high socioeconomic status peoples leaned whiter), the racial composition of your friends, and what you ate. One man appealed his classification as Black and was successful in getting his status changed to Coloured (one level up on the racial totem pole) because he told the judges that:

I do not just drink kaffirbeer (i.e. beer produced by blacks, or native African-style beers like umqombothi). In the afternoons we eat meat, rice and vegetables, unlike natives.

http://pdfproc.lib.msu.edu/?file=/DMC/African%20Journals/pdfs/transformation/tran047/tran047005.pdf