Meaning
To be running on fumes / to be wiped out
Example
Depois daquela maratona, voltei pra casa só o pó.
After that marathon, I came home running on fumes.
Origin
A modern Brazilian image of total exhaustion: when you've been worn down to nothing but dust.
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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