Something extraordinary or impressive, or a person who does something remarkable; also something difficult or challenging.
Doozy (variant spelling) emerged in American slang around 1900, possibly from 'Duesenberg' (the luxury car brand) or from an exaggerated form of 'do.' The variant 'doozer' is less common but follows the same origin.
The Fraggle Rock characters 'The Doozers' borrowed this slang word perfectly—creatures building magnificent structures perfectly capture the 'something impressive' meaning. It's slang that's been around long enough to feel timeless.
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