Definition of riff-raff noun from the Oxford Advanced American Dictionary

 

riff-raff

 noun
noun
NAmE//ˈrɪf ræf//
 
[uncountable](disapproving)
 
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an insulting way of referring to people of low social class or people who are not considered socially acceptable We don't want to let all the riff-raff in.
See the Oxford Advanced Learner's Dictionary entry: riff-raff