Meaning
To mess up / To slip up
Example
Desculpe amigão... eu dei mancada interpretando mal a situação.
Sorry man... I messed up by misreading the situation.
Origin
'Mancada' from 'manco' (limp) — a clumsy step, literally a stumble. The phrase is attested as Brazilian Portuguese slang from the mid-20th century.
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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