Meaning
Slacking off, faking it, or stalling.
Example
Aquele menino ali não quer trabalhar, tá só no migué.
That boy over there doesn't want to work, he's just slacking off.
Origin
Dar o migué is common across Brazil, possibly derived from the Spanish name Miguel used in expressions about someone who plays dumb.
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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