Blurb - Cockney rhyming slang
Cockney rhyming slang is a pretty simple if somewhat odd affair. It basically consists of a couplet of words, the second of which rhymes with the word you're actually aiming at. For example, the word "glasses" is represented by the phrase "Aristotle Onassis" (a Greek shipping magnate), and "look" by "butcher's hook". To further complicate matters, you can use only the first word of the couplet to refer to the word you're ultimately aiming at - so your Aristotles are your glasses, and you can take a butchers out of them at the scenery once you've put them on.
I think it would be fair to say that outside of the east end of London, Cockney rhyming slang is much more often talked about than actually used. Some phrases (e.g. "butchers" in the example above) are in fairly common usage country-wide, but others (e.g. Aristotles) are not. I've tried to put the most widely used ones into the dictionary. Whether I've succeeded or not I'm not too bothered; as I've mentioned a few times you haven't payed a cent for this so you can take what you're goddamned given.