Meaning
Something very cool, excellent.
Example
Que blusa pai d'égua essa que tu comprou!
What an awesome shirt you bought!
Origin
Originária do Norte e Nordeste, a expressão junta "pai" e "égua" para denotar algo de grande valor ou qualidade, historicamente ligada a cavalos reprodutores (o pai da égua).
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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