mockney

noun

(often capital) a person who affects a cockney accent
an affected cockney accent

adjective

denoting an affected cockney accent or a person who has one

Word Origin for mockney

C20: mock + (cock)ney
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012