Meaning
To be a brown-noser / To suck up
Example
Leonardo vive puxando saco do chefe! Deve estar querendo uma promoção!
Leonardo is always sucking up to the boss! He must be trying to get a promotion!
Origin
The Brazilian origin most cited goes to Brazilian military slang of the 19th century: the subordinate who physically carried the officer's kit bag ('saco' = bag, sack) — flattering the boss in the most literal way. By the 20th century the phrase was a standard insult for obsequious behavior.
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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