Actually Janie Jones was a famous madam of the 70s - which means she ran a social escort (prostitution) service. The other explanations are right. Of course, in the 70s in Britain the shitty jobs were the only ones available, so letting your employers know how you really felt about your job was widely discouraged. But listening to a song that implies it's a good idea is pretty liberating.
Actually Janie Jones was a famous madam of the 70s - which means she ran a social escort (prostitution) service. The other explanations are right. Of course, in the 70s in Britain the shitty jobs were the only ones available, so letting your employers know how you really felt about your job was widely discouraged. But listening to a song that implies it's a good idea is pretty liberating.