Meaning
Gold-digger marriage / To marry for money
Example
Ela casou com ele, ela tem 25 anos e ele 60. Ela é mestra em dar o golpe do baú!
She married him, she is 25 and he is 60. She is a master gold digger!
Origin
'Baú' literally means 'trunk' — the wooden chest where 19th-century Brazilians stored savings and dowries. 'Golpe do baú' described the tactic of marrying (usually an older wealthy widow or widower) specifically to get hands on the trunk's contents.
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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