Meaning
To grab a bite / to chow down
Example
Vamos bater um rango antes do filme?
Shall we grab a bite before the movie?
Origin
Rango is informal Brazilian Portuguese for food, and bater um rango means simply to have a meal. The word is often said to have entered everyday speech via 20th-century military slang, but no clear early-attestation source confirms a specifically military origin; it is now standard informal Brazilian Portuguese for any meal.
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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