What does purposely under-employed mean?

There is an old joke at the family courthouse -- RAIDS is rampent in the family courts -- RECENTLY ACQUIRED INCOME DEFECIENCY SYNDROME! If you are a doctor and you decide to quit practicing and go to school or just be a grocery stocker, the courts are NOT going to be sympathetic. You have the ABILITY to learn more than minimum wage. Yes, education is wonderful but your children need to eat. They cannot wait 2-3 years until you graduate from school and begin a new career. Is it fair? No, but you brought these children into the world and it is not fair for taxpayers money to support them!