Meaning
very angry, furious
Example
Quando ele perdeu o jogo, ficou virado no mói de cuento.
When he lost the game, he was furious.
Origin
Faz alusão a um maço (mói) de coentro (cuento) todo retorcido e bagunçado, como a mente de alguém com raiva.
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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