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 expression buscar pelo em ovo ("to look for hair on an egg") rests on a plain impossibility: an eggshell is smooth and bald, so there is no hair on it to find.
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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