Meaning
To talk nonstop / To talk someone's ear off
Example
Não aguento mais meu colega de trabalho, ele não para de falar pelos cotovelos!
I can't stand my coworker anymore, he won't stop talking my ear off!
Origin
The image is of someone who talks so much they gesture wildly enough to bruise their own elbows. Attested in Portuguese since at least the 19th century.
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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