Meaning
To drink heavily / to get hammered
Example
Amanhã é dia de churrasco e vou comer água!
Tomorrow is barbecue day and I'm getting hammered!
Origin
Bahian and Northeastern slang for drinking heavily. The joke is in the calm understatement — alcohol referred to as if it were water, and drinking as if it were eating.
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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