“The burbs” is a short, informal way to say the suburbs — the towns and housing areas around a city, where many families live and people often need a car. You almost always say it with “the”: “out in the burbs.” It sounds American and casual, a little jokey, the way a city person might talk about leaving downtown. You would not put it in a careful school essay; suburbs is the full word. Though actually, it can feel slightly teasing too — quiet streets, similar houses, shopping malls — not only a map word. People do not usually say “a burb.”

郊區（口語）