riffraff

n.<贬>乌合之众,群氓,<方>渣滓

废物；无赖；社会渣滓；

名词；

1、He was surrounded by a group of riffraff.
他被一群社会渣滓包围着。
2、Stay away from those riffraffs, they are nothing but trouble.
远离那些无赖，他们只会带来麻烦。