WordNet (r) 3.0 (2006):

white trash
    n 1: (slang) an offensive term for White people who are
         impoverished [syn: white trash, poor white trash]

The Free On-line Dictionary of Computing (30 December 2018):

white trash

    A pejorative term for Intel-based
   microcomputers, used by NeXT users at UK law firm
   Linklaters & Paines to contrast these machines with their
   black NeXT boxes.

   (1996-09-04)