Meaning
To nitpick / To split hairs
Example
Você não tem nenhum problema de saúde, o médico já disse, não deveria buscar pelo em ovo!
You don't have any health problems, the doctor already said, you shouldn't nitpick!
Origin
The image — searching for hair on an egg, where there isn't any — captures pointless fault-finding. The phrase is attested in Portuguese dictionaries from the 19th century and has regional variants elsewhere in the Iberian Peninsula.
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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