Multicultural London English - definition and synonyms

noun [uncountable] linguistics 

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/ˌmʌltikʌltʃərəl lʌndən ˈɪŋglɪʃ/
  1. a way of speaking that is common among young people in London and the south of England. It has elements of Caribbean, South Asian and African American English as well as features of traditional London speech; for example, the use of 'was' for all forms of the past tense of 'be', and the use of the question tag 'innit'.