You can view the Frank Zappa interview at YouTube here.
Frank Zappa: (describing the Thing-Fish musical) There's this Evil Prince and part-time theater critic who's found the solution to the white man's burden, which is how to get rid of all unwanted highly rhythmic individuals and sissy-boys. He goes to San Quentin to test this stuff on the inmates because they used them before, when they were working with syphilis. It doesn't kill these guys, it makes them real ugly. They wind up with a head like a potato, lips like a duck, big white gloves like Al Jolson used to wear, and these garments which they refer to as "nakkins," the first part being a nun's habit, and the lower part being Aunt Jemima's dress.