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 PostThere is a big deposit of sympathy in the bank of love, but don't draw out little sums every hour or so - so that by and by, when perhaps you need it badly, it is all drawn out and you yourself don't know how or on what it was spent.
Emily PostGood manners reflect something from inside-an innate sense of consideration for others and respect for self.
Emily Post