Meaning
To be loaded / rolling in cash
Example
Depois daquela herança ele tá forrado.
After that inheritance he's loaded.
Origin
Forrar means to line — to put a layer inside something (as in lining a coat). Applied to a person, forrado evokes someone wrapped or padded with money. The verb itself entered Iberian Portuguese and Spanish from Frankish *fodr (related to German Futter, 'lining'); the financial idiom is used in both languages.
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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