“(T)he first recorded use of “bad shag” dates to 1788, that to “beat skin”* (1944) doesn’t mean what you think, you pervert, and that the term “dude” was once (1883) considered so offensive that “a vigorous Bloomington woman cowhided a clerical editor for calling her a dudess.”
— Maud Newton has some fun with Jonathon Green’s Dictionary of Slang. I promise you will learn something.