To non-Londoners, anybody from the capital city of Great Britain. To those in the know, anybody who was born within the sound of Bow Bells. Cockney literally means cock's egg, a misshapen egg such as sometimes laid by young hens. Originally used when referring to a weak townsman, as opposed to the tougher countryman, by the 17th Century the term, through banter and popular usage, came to mean a Londoner. Today's natives of London, especially its East End use the term with respect and pride - "Cockney Pride".

Cockney Rhyming Slang is the dialect of English traditionally spoken by cockneys.

The popular BBC television soap opera EastEnders is set amongst people who could be called Cockneys.

http://www.cockney.co.uk would appear to be a very comprehensive resource for all things appertaining to cockneys.