1. 贫民区;贫民窟
    A slum is an area of a city where living conditions are very bad and where the houses are in bad condition.

    e.g. ...a slum area of St Louis.
           圣路易斯的贫民区
    e.g. ...inner-city slums in the old cities of the north and east.
           北部和东部老城市里的市中心贫民区

2. 逛贫民窟;体验下层社会的生活
    If someone is slumming it or is slumming, they are spending time in a place or in conditions that are at a much lower social level than they are used to.

    e.g. ...rich kids slumming it.
           体验下层社会生活的有钱人的孩子
    e.g. ...aristocratic types who enjoyed slumming around in musty old Scottish castles.
           喜欢在发霉的苏格兰古堡里体验苦日子的贵族阶层