Meaning
Mooch / freeloader
Example
Esse aí é boca de me dê, vive pedindo cigarro pros outros.
That guy's a mooch — always asking others for cigarettes.
Origin
A transparent Northeastern coinage: boca de me dê = 'a "give-me" mouth' — a person whose every interaction is a request for something.
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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