flapper -
A flapper valve in a toilet-flushing mechanism.
Wikipedia
Flapper in the 1920s was a term applied to a "new breed" of young Western women who wore short skirts, bobbed their hair, listened to jazz, and flaunted their disdain for what was then considered acceptable behavior. Flappers were seen as brash for wearing excessive makeup, drinking, treating sex in a casual manner, smoking, driving automobiles and otherwise flouting social and sexual norms. Flappers had their origins in the period of liberalism, social and political turbulence and increased transatlantic cultural exchange that followed the end of the First World War, as well as the export of American jazz culture to Europe.
