Jon and Juliet discuss some of the fantastic on-line tools for researching slang through time (among other things): Historical Dictionaries and—cue the dramatic music—The Corpus.
Links from the show:
Urban Dictionary (http://www.urbandictionary.com)
On-line Slang Dictionary ( http://onlineslangdictionary.com)
Historical Dictionary of American Slang (http://www.alphadictionary.com/slang/)
What is a Corpus? Slides by linguist Jonathan Owen (http://allthingslinguistic.com/post/144161398933/interesting-slides-about-copyediting-and-corpus)
The Google Corpus or Ngram Viewer (https://books.google.com/ngrams)