Meaning
To have a quick chat
Example
Vem cá, vamos ter dois dedos de prosa, faz tempo que não nos vemos.
Come here, let's have a quick chat, it's been a while since we last saw each other.
Origin
'Dois dedos de prosa' literally = 'two fingers of conversation' — a short, measured amount, like the finger-width of a drink.
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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