Meaning
to get into trouble, to screw up
Example
Ele foi mexer com o chefe e acabou se lascando.
He messed with the boss and ended up screwing himself over.
Origin
To be lascado is to be chipped or cracked, pointing to a state of harm or bad luck.
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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