 And they had a great definition for a flapper, which I don't quite understand, but I think it sounds great. A flapper is somebody who has a jitney body and a limousine mind. So here are some examples of their slang. A biscuit is a pedable flapper. A boob tickler is a girl who entertains her father's out-of-town customers. And sweetie, of course, in the best passive-aggressive sense, means anybody a flapper hates.