Meaning
Go and come straight back as fast as you can.
Example
Vá num pé e volte no outro, o jantar já vai ficar pronto.
Go and come straight back — dinner's almost ready.
Origin
The image is transparent: you're in such a hurry that you barely set down one foot before you're back with the other — there and back in the blink of an eye.
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More idioms
Cria fama e deita na camaOnce you've built a reputation, it sticks — people go on believing it of you with no further effort.Comi que fiquei tristeTo eat so much you're uncomfortably stuffed.Saco vazio não para em péYou can't function on an empty stomach — you have to eat first.Água mole em pedra dura, tanto bate até que furaSteady, persistent effort eventually overcomes even the hardest obstacle.Filho de peixe, peixinho éChildren take after their parents — the apple doesn't fall far from the tree.De maneira nenhumaNo way; by no means; absolutely not. Used to emphatically deny or refuse something.dê seus pulosFigure it out yourself, manage on your ownser laranjaTo be a front man, to lend one's name for illegal or fraudulent activitiesse desenmerdarTo sort things out on one's own, to get oneself out of trouble (vulgar)dar broncaTo scold, to give someone a telling-off