The phrase "top job" is an idiomatic expression that means a position or role of great responsibility, importance and prestige. It refers to a job that is highly sought after because it offers high levels of authority, influence, and reward. The term can be used in both positive and negative ways - for example, someone might say "I got the top job at the company" meaning they were successful in obtaining their desired position or goal; on the other hand, someone else could say "he didn't get the top job, but he worked hard to try and achieve it." In summary, a "top job" is an esteemed role that many people aspire to attain.