Meaning
To argue / To have a shouting match
Example
Os dois ficaram batendo boca no meio da rua, que vergonha!
The two of them were arguing in the middle of the street, how embarrassing!
Origin
A expressão nasce da imagem direta da discussão: na troca acalorada de réplicas, as bocas parecem "bater" umas nas outras, golpe verbal após golpe verbal.
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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