Cockney refers to:
* A person born and raised in the East End of London. This is the traditional definition and refers to a specific dialect and culture.
* The dialect spoken by Cockneys. This dialect is characterized by its distinctive accent, vocabulary, and grammar.
* A specific type of rhyming slang. Cockney rhyming slang is a unique feature of the Cockney dialect where words are replaced with rhyming phrases. For example, "trouble and strife" is used for "wife".
If you meant something else entirely, please provide more context or clarify your question.