Work, a job.
Completely normal in daily speech, not markedly slangy. "Laburar" is the verb and is used more than "trabajar" in casual conversation.
From Italian "lavoro" — one of hundreds of words Italian immigrants left in Buenos Aires Spanish through the lunfardo slang of the port.
Mexico says chamba, Costa Rica says brete, Chile says pega, Spain says curro.
Reading a definition isn't the same as saying it to someone. Lingo Kaiava is a voice tutor set to Argentine Spanish — it uses laburo the way locals do, corrects you in the moment, and never "fixes" the way real people actually talk into textbook Argentine Spanish.
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