to be running on fumes, to be wiped out
Depois daquela maratona, voltei para casa só o pó.
After that marathon, I came home running on fumes.
Só o pó ("just the dust") is a short, modern way of saying you are completely worn out. It clips the fuller Brazilian saying só o pó da rabiola — "only the dust of the kite-tail." A kite's rabiola (tail) frays away with use until nothing useful is left, so a person reduced to "just the dust" has nothing left in the tank.
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