white trash

from 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}]

from The Free On-line Dictionary of Computing (8 July 2008)

white trash

   <abuse, hardware> 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)