Meaning
No way / Not in a million years
Example
Mãe, dá-me um dinheiro? — Nem que a vaca tussa!
Mom, can I have some money? — Not in a million years!
Origin
A classic Brazilian folk impossibility: cows don't cough. Saying 'not even if the cow coughs' is saying 'never, no matter how absurd the condition.'
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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