Synonyms of 'riff-raff'
rabbleDictionary, undesirables, scum
That helps to keep out the riff-raff.
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the masses; mob; rabble
If someone refers to the hoi polloi, they are referring in a humorous or rather rude way to ordinary people, in contrast to rich, well-educated, or upper-class people.
Inflated costs are designed to keep the hoi polloi at bay.
Thesaurus for riff-raff from the Collins English Thesaurus
If you refer to a group of people as riff-raff , you disapprove of them because you think they are not respectable .