Superlative form of 'bum'—the most disappointing, unpleasant, or of poorest quality.
From 'bum' as an adjective (meaning bad or of poor quality, popularized in American slang) plus '-est' superlative suffix.
Slang superlatives like 'bummest' reveal how younger generations reshape language—they're often more creative and honest than formal alternatives like 'most inferior.'
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