web definition from Google below as manpower search engine
人肉搜索,是一种以互联网为媒介,部分基于用人工方式对搜索引擎所提供信息逐个辨别真伪,部分又基于通过匿名知情人提供数据的方式搜集信息,以查找人物或者事件真相的群众运动。人肉搜索有时也造就了网络爆红现象。
You can image it a search aim at somebody, a specific person, with help of amounts of netizen, the man behind end computer. Such search commonly reveals targets' private information, such as address,telephone number, working or studying places,etc. Like a double-edge sword, it is seemingly immortality but benefits people sometimes, like exposing bad.