@@AroushRaja It doesn’t have anything to do with London people, people in a lot of places around the Uk talk like this even people in Scotland. We call it a chav accent because it’s annoying and people who talk like this start to act like something they’re not.
Okay I'm very late but the accent has a name. The MLE (multi-cultural london english) is an accent originated in London as of mass migration in the area and is based of the traditional east end cockney dialect. It is normally associated with chavs or roadmen, but trust me as someone who lives in south-London, normal (and often the sweetest) people talk like this over here.