Her lingo went from the cockney to the gringo
Cockney is a London linguistic, most commonly recognised for its rhyming slang and association with London stereotypes portrayed in Hollywood film. In turn, gringo is a dialectic language – a cross between Spanish, Portuguese and English. The term gringo is usually used to segregate members of the Hispanic society in Western culture. By combine to two, Jamie T is pointing out hypocrisy: it’s highly unlikely a person would naturally speak in both cockney and gringo.