The fact that slang is apt and forceful makes its use irresistibly tempting. Coarse or profane slang is beside the mark, but "flivver," "taxi," the "movies," "deadly" (meaning dull), "feeling fit," "feeling blue," "grafter," a "fake," "grouch," "hunch" and "right o!" are typical of words that it would make our spoken language stilted to exclude.
Emily PostAlas! it is true: "Be polite to bores and so shall you have bores always round about you."
Emily PostThe fault of bad taste is usually in over-dressing. Quality not effect, is the standard to seek for.
Emily PostWhenever two people come together and their behavior affects one another, you have etiquette.
Emily Post