Meaning
The middle of nowhere / the back of beyond
Example
O sítio fica numa baixa da égua, levei três horas pra chegar.
The farm is in the middle of nowhere — it took me three hours to get there.
Origin
Literally 'the mare's lowland.' The precise origin is uncertain — Ciberdúvidas, consulting standard reference dictionaries (Houaiss, Michaelis), found no documented historical source.
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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