Guttersnipe

Noun

 * 1) A person who is from the lowest social or economic class.
 * 2) A street urchin.

Thesaurus
Arab, Babbitt, Philistine, arriviste, beach bum, beachcomber, beggar, bo, boor, bounder, bourgeois, brat, bum, bummer, cad, churl, clown, dogie, epicier, gamin, gamine, groundling, hobo, homeless waif, hooligan, idler, ill-bred fellow, landloper, lazzarone, loafer, looby, losel, lout, low fellow, mucker, mudlark, nouveau riche, parvenu, peasant, piker, ragamuffin, ragman, ragpicker, ribald, rogue, rough, roughneck, rounder, rowdy, ruffian, ski bum, stiff, stray, street Arab, street urchin, sundowner, surf bum, swagman, swagsman, tatterdemalion, tennis bum, tramp, turnpiker, upstart, urchin, vag, vagabond, vagrant, vulgarian, vulgarist, waif, waifs and strays, wastrel, yokel