It means working. Exercise a certain trade, fulfill the assigned tasks. It is a term used in Uruguay and Argentina.
"Working" . From the Italian "lavurare", and this from the Latin "laborare", to work. 1 . Word from the River Plate . Lunfardo, colloquial. Intransitive verb. 1 . Work, have a paid occupation. According to RAE .
laburar: work. to exercise or develop a stifling, exhausting task.