Meaning
To stick one's oar in / to give one's two cents uninvited
Example
Ela adora dar pitaco em assuntos que não são dela.
She loves sticking her oar in business that isn't hers.
Origin
The origin of pitaco is obscure. Two recurring guesses: (1) the Greek statesman Pittacus of Mytilene, traditionally cited for his sayings; (2) a Frenchism from petit coup ('small move/blow'), via card-game slang.
Practice idioms with the Idiom Trainer
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.
More idioms
Acertar na moscaTo guess correctly / To hit the nail on the headAmigo da onçaA fake/false friendAndar na linhaTo toe the line / To behave properlyArmar um barracoTo cause a public sceneRodar a baianaTo cause a public scene / To go ballisticArrumar sarna pra se coçarTo ask for troubleArrastar as asasTo hit on someone / To flirtAbrir o jogoTo come clean / To open upArregaçar as mangasTo roll up one's sleeves / To get to workAgarrar com unhas e dentesTo hold on for dear life / To seize an opportunity