Learn to start sounding like a "carioca" by using some basic expressions;
E aí maluco, beleza? (Word up dawg?)
E aí cumpadi, tudo jóia? (Hey buddy, everything cool?)
E aí cara, tudo em cima? (Hey dude, everything alright?)
Important thing is to learn the ATTITUDE so you can become a carioca.
Cheers!! Obrigado!