So for your Cliff Clavin for today, I bring you the english dialect cockney.
From the cockney.co.uk website:
"To be a true Londoner - A Cockney, you have to be born within hearing distance of the bells of St. Mary Le Bow, Cheapside, in the City of London
'Cockney' or 'cock's egg' was a 14th Century term applied contemptuously by rural people to native Londoners who lived rather by their wits than their muscle. Today's natives of London, especially its East End use the term with pride - 'Cockney Pride'."
Apparantly a curious rhyming slang system that we've all heard in movies. Here is a great kinda easy reference, as well as this kinda fun translator.