Meaning
To pull a fast one / To con someone
Example
Você pagou demais. Ele passou a perna em você.
You paid too much. He pulled a fast one on you.
Origin
Rural Brazilian slang: 'passar a perna' is literally to trip someone up by slipping your leg in front of them — a cheap, dishonest move.
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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