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
'Bater boca' = to hit mouths — a verbal sparring match.
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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