Meaning
A stroke of luck / lucky as anything
Example
Achar dinheiro na rua é uma égua de largura.
Finding money on the street is a real stroke of luck.
Origin
Northern Brazilian slang built off égua, the Pará-Amazonas all-purpose interjection ('wow!'). Égua de largura literally evokes a wide-bodied mare and intensifies the exclamation: a piece of unusually big luck.
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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