You know what "booze" means, of course, but what if you asked someone in London for a definition -- say, 500 years ago? Lexicographer Jonathon Green will tell you the word is a lot older than you might think. He's spent the last quarter century studying slang, and its history, in the English language. The respected editor of the authoritative Cassell's Dictionary of Slang, Jonathon's written over a dozen books on the subject and has collected a database of over 100,000 slang words. He's now working on a mammoth multi-volume dictionary, due out in 2008, that will cover a half a millennium's worth of words, phrases and figures of speech -- salty and otherwise -- that have seeped into English as slang. We talked to Jonathon about his passion:

Grant Barrett, the author of The Official Dictionary of Unofficial English, is living a word lover's dream: By day he's a lexicographer and project editor at the Oxford University Press's "Historical Dictionary of American Slang," and by night he runs the Double-Tongued Word Wrester's Dictionary, his acclaimed website dedicated to hunting "under-documented words from the fringes of English." After getting hooked on his Double-Tongued discoveries -- from bark mitzvah to whoadie to blow a hoolie -- we had to talk to him. Here's our conversation:

VT: How do you find your Double-Tongued words?