lumpenproletariat (n.)youdaoicibaDictYouDict[lumpenproletariat 词源字典]
1897, from German Lumpenproletariat (1850), from Karl Marx, who coined it to mean "rabble, poorest of the working class," from German lump "ragamuffin" + proletariat. Secondary sense of "boorish, stupid people" led to lumpen- being taken as a suffix meaning "unenlightened."[lumpenproletariat etymology, lumpenproletariat origin, 英语词源]