Meaning
To tell someone to get lost / Go fly a kite
Example
Já estou cansada de você me perturbar, vá pentear macaco!
I'm tired of you bothering me, go fly a kite!
Origin
Ir pentear macaco ("go comb a monkey") sends a bother off to a pointless, faintly ridiculous chore — grooming an animal that will never look the part. It belongs to an old Portuguese family of brush-offs built on the monkey, alongside ir bugiar, from bugio (an archaic word for ape).
Source: Ciberdúvidas da Língua Portuguesa.
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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