melanin-challenged vs white man

melanin-challenged

adj
  • white; having white skin or belonging to the white culture; not black 

white man

noun
  • Used other than figuratively or idiomatically: see white, man. 

  • white people collectively; white culture. 

  • A Caucasian man; a man of northern European descent or having that appearance. 

How often have the words melanin-challenged and white man occurred in a corpus of books? (source: Google Ngram Viewer )