(n). Any money in a given year, made working at a variety of low-paying (often per hour, without benefits) jobs.
Categories of jobs include (but not limited to): manual labor, seasonal empoyment, temporary employment, per diem (on call basis), and food work.
Highly skilled and educated people often have to take jobs like these in difficult times.
Hey Will, some friends and I are flying down to Rio for two weeks for a vacation. Do you want to join us?
Sorry, John. I won't be able to, due to my four figure salary.