Poriki
I think you are referring to a dialect of the Poriki language. Widely spoken all over Chennai, especially by college students who have got in through quotas, auto-drivers, tea-shop patrons, and other sundry folks. It provokes great glee, particularly if a group of speakers get together. It is best spoken with exaggerated gestures, in a rapid tone, and is a key criterion to joining a Kazhagam party. Indications are that it may soon replace "Tamizh" as the first/second language taught in schools. If you need more details, please ask.