Mockney (a portmanteau of "mock" and "Cockney") is an affected accent and form of speech in imitation of Cockney or working class London speech, or a person with such an accent. A stereotypical Mockney speaker comes from an upper-middle class background.
A person speaking with a Mockney accent might adopt Cockney pronunciation but retain standard grammatical forms whereas the genuine Cockney speaker would use non-standard forms (e.g. negative concord).
The first published use of the word according to the Oxford English Dictionary was in 1989.
It is an affectation sometimes adopted for aesthetic or theatric purposes, other times just to sound “cool”, generate street credibility or give the false impression that the speaker rose from humble beginnings and became prominent through some innate talent rather than the education, contacts and other advantages a privileged background tends to bring. Britpop band Blur was said to have “Blur's mockney, down-the-dogs blokey charm”. Mick Jagger is often accused of having been the first celebrity in modern times to overplay his regional accent in order to boost his street credibility.
One explanation of dialect adoption given in social linguistics is prestige. A person is likely to adopt speech patterns (including accent, vocabulary, dialect or even language) which they perceive as 'prestigious'.
The concept of communication accommodation, either upwards or downwards in idiolect, can be seen in many social interactions. One can put someone at ease by speaking in a familiar tone or intonation, or one can intimidate or alienate someone by speaking more formally. For example, in a courtroom, a more formal register with technical legal jargon can be used to intimidate a defendant. In contrast, Mockney seeks to lower the perceived socio-economic class of the speaker.
Notable persons described as Mockney include:
- Damon Albarn
- Tim Lovejoy
- Lily Allen
- Nigel Kennedy
- Kate Nash
- Guy Ritchie
- Mike Skinner
- Jamie Oliver 
- Johnny Vaughan
- George Osborne
- Mark Steel
See also 
- Received Pronunciation
- Class tourism
- Register (sociolinguistics)
- Prestige dialect
- "British Accents: Cockney and Mockney", rogalinski.com.pl. Retrieved 18 December 2011
- Cockney at oed.com/8
- http://www.oed.com/Entry/245968 citing Face magazine issue 78, Jan 1995
- "Radio catchup: Jagger's Jukebox, Adam Buxton's breakup tips and the power of Charlie Brooker", guardian.co.uk. Retrieved 15 October 2010
- CBC.ca - Arts - Music - Wot's He Sayin'?
- Lily Allen, Notting Hill Arts Club, London | Music | The Guardian
- "Let's hear it for the British pop babes" telegraph.co.uk
- Guy Ritchie, the mockney with a king in the family
- The Streets - | album review