Superlative form of crummy; the most poor quality, unpleasant, or undesirable.
Regular superlative form created by adding '-est' to 'crummy,' following standard English patterns for indicating the highest degree of an adjective's meaning.
'Crummiest' perfectly demonstrates how English takes a casual slang word like 'crummy' and lets it follow all the normal grammar rules, treating slang the same way as formal vocabulary.
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