Cursebird: What the f#@! is everyone swearing about? Slang of the 1920. 1736 Canting Dictionary. A Collection of the Canting Words and Terms, both ancient and modern, used by Beggars, Gypsies, Cheats, House-Breakers, Shop-Lifters, Foot-Pads, Highway-Men, &c; Taken from The Universal Etymological English Dictionary, by N. Bailey, London, 1737, Vol. II, and transcrib'd into XML Most Diligently by Liam Quin. I don't have a slang word of the day yet, but this online dictionary of thieving slang is more than just a list of slang words and their meanings. There are examples of how the slang words and phrases were used, and I have added lots of links between the entries so you can use it as a slang thesaurus too.
Most of the links here are from lists of resources for writers, and if you are writing about the late 1600s or early 1700s in England (especially with London slang) you'll find a lot of ideas here. Nathan Bailey published this slang glossary in 1737, and he didn't hold back: there are sex slang terms along with prison slang and even eighteenth century urban slang phrases! Charles Ponzi. American Life in the 1920s.