English version

pond scum

From Longman Dictionary of Contemporary Englishpond scumˈpond scum noun [uncountable]  1 American English informal someone that you do not like, respect, or trust He’s lower than pond scum.2 algae
Examples from the Corpus
pond scumBernie's nothing but pond scum. You don't need him.Borden Stoppelgard is pond scum, Bernie.
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