From Longman Dictionary of Contemporary Englishflapperflap‧per /ˈflæpə $ -ər/ noun [countable] FASHIONABLEa fashionable young woman in the late 1920s
Examples from the Corpus
flapper• A flapper had the body of an adolescent boy, not a grown-up woman.• She would pave the way for a much more slender ideal: the flapper.• The flapper had to be a good consumer, keeping up with fashion and buying the latest in beauty products.• The flapper rebelled not only against Victorian manners and morality but against the body that went with it. 