the lowest of the low
From Longman Dictionary of Contemporary Englishthe lowest of the lowthe lowest of the lowa) informalBAD PERSON someone you think is completely unfair, cruel, immoral etc b) CLASS IN SOCIETYsomeone from a low social class – often used humorously → lowExamples from the Corpusthe lowest of the low• Seeing the lowest of the low on a daily basis made you glad your child was normal.