riff-raff

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Western Europe may have cheered the revolution, but it fears a flood of riff-raff from the east.
西欧可能会对革命欢欣鼓舞，但也担心来自东部的贫民潮。
Littered on the grass, we seemed dingy, urban riff-raff. We defiled the scene, like sardine-tins and paper bags on the seashore.
我们呢，却好像是一堆肮脏的城市垃圾，被胡乱丢在草地上，如同海滩上的纸袋和沙丁鱼罐头盒一样败坏风景。
Police harassment is minimal, “at least to start with”. Riff-raff and drunks from surrounding villages are kept away by tight security.
人们很少受到警察骚扰（至少刚开始是这样），严格的安保赶走了附近村子的社会闲散人员和醉汉。

He was like the rest of us riff-raff, middle class kids from unglamorous hard working families who believed in the future.
FORBES: Getting Over Our Over-Levered Selves
The new tax may send a definite message to wealthy citizens to redistribute their wealth to the rest of the Russian riff-raff.
FORBES: Rich Russians Also Lament New Tax Hikes
Mr Evans blames the city's strict regulation of street concerts—which cynics say serves more to protect club owners from competition than to keep the riff-raff away.
ECONOMIST: Letter from the Mississippi Delta: The rebirth of the blues

If you refer to a group of people as riffraff, you disapprove of them because you think they are not respectable.