flapper

flapper puhekieltä A young woman, especially when unconventional or without decorum; now particularly associated with the 1920s. (defdate)
1910, (w), ‘The Baker's Dozen’, Reginald in Russia:

I paid violent and unusual attention to a flapper all through the meal in order to make you jealous.

F. Scott Fitzgerald is best known as a chronicler of the 1920s and as the writer who, more than any other, identified, delineated, and popularized the female representative of that era, the flapper. Though it is an overstatement to say that Fitzgerald created the flapper, he did, with considerable assistance from his wife Zelda, offer the public an image of a young woman who was spoiled, sexually liberated, self-centered, fun-loving, and magnetic.(..)Although she is often seen now as a mere fashion of the bygone Jazz Age, the flapper should be regarded as one of the great authentic characters in American history.

Among McPherson's most passionate and visible advocates were Southern California's young flappers, who turned out in droves to cheer on the evangelist. While most fundamentalists vehemently criticized flappers, viewing them as symbols of moral decay and the decline of Victorian gender identities, McPherson had embraced them. Critics of her Bible college identified the young female ministers with whom she surrounded herself not as holdouts to Victorianism, but as outright flappers. The press even dubbed one of McPherson's most successful young protégés the flapper evangelist.

The flapper of a porpoise.

It was still too shallow for the turtle to swim, but it used its four flappers with so much effect against its two assailants, as to give them a thorough shower-bath.