"excellent," slang from 1897; probably not related to much earlier slang noun meaning "a woman's breast" ["...whose pritty duckys I trust shortly to kysse," Henry VIII, letter to Anne Boleyn, c.1536].
mod. okay; good. (Often used sarcastically.) : Now, isn't that just ducky?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Example sentences
If so maybe the rubber ducky idea isn't the best application.
Rubber ducky racers will be available for adoption throughout the day.
He was already familiar with flesh-and-blood armadillos, having eaten those shucked, ducky ones with his ostrich dumplings.
The latter has only confused matters thoroughly by having everything turn out ducky in the end.