Meaning
To wash one's hands of it
Example
Cansei de aconselhar meu tio, lavei as mãos, vou viver minha vida!
I'm tired of advising my uncle, I washed my hands of it!
Origin
From Matthew 27:24: when the crowd demands Jesus be crucified, Pontius Pilate literally washes his hands in front of them, declaring himself innocent of the execution. The gesture becomes the universal symbol of refusing responsibility.
Source: Matthew 27:24 (NIV).
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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