white trash (n.)youdaoicibaDictYouDict[white trash 词源字典]
1824, originally Southern U.S. black slang.
The slaves themselves entertain the very highest contempt for white servants, whom they designate as 'poor white trash.' [Fanny Kemble, journal, Jan. 6, 1833]
[white trash etymology, white trash origin, 英语词源]