lumpen

From Dictionary.com/Word of the Day:

lumpen \LUHM-puhn; LUM-puhn\, adjective:
1. Of or relating to dispossessed and displaced individuals, especially those who have lost social status.
2. Common; vulgar.

noun; plural lumpen, also lumpens:
A member the underclass, especially the lowest social stratum.

Lumpen is from German Lumpenproletariat, "degraded stratum of the proletariat," from Lump, "a contemptible person" (from Lumpen, "rags") + Proletariat, "proletariat," from French.