Meaning
to take advantage of someone, to be a freeloader
Example
Ele vive arregando dos amigos e não paga nada.
He is always freeloading off his friends and never pays for anything.
Origin
Deriva de "arrego" (desistir, pedir ajuda), mas no Recife tomou o sentido de explorar a boa vontade alheia.
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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