@durinlogan
Hey neighbor (I'm from São Paulo, the capital), well I have a word that comes to my mind so I can answer: regionalismo.
Just as in Sao Paulo we speak "Ora meu", and in Minas Gerais it is said "Uai" or even "Oxe" in much of the Nordeste, Derrière, and an old São Paulo giria.
I think it was very common there at the end of the 80's, beginning of 90, and although it seems, I'm not that old, I'm 38, I heard a lot of it in my childhood / adolescence and I liked it.
Note: Rabão also use a lot.