Used in several different ways. 1. "Job" can be used to describe whether something was sorted out between individuals satifactorily ("job"), 2. whether a job was done well by someone("da job") 3. or whether something looked convincing or not ("da job").
If you witness any brawling or fighting or any non acceptable behaviour, it is necessary to shout this in a thick, Dublin accent. Especially when two junkies are fighting on Talbot Street.