to mess things up, to put one's foot in it
Ele meteu os pés pelas mãos quando tentou consertar o computador sozinho.
He messed things up when he tried to fix the computer by himself.
The phrase paints a deliberately absurd picture: someone so flustered they put their feet where their hands should go — meter os pés pelas mãos, literally "to put the feet through the hands.
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