(1) combination of hobby and job
(2) the requirements and responsibilities of a job, but the pay of a hobby
(3) typically, the jobbyest believes they have a job, but reasonable people may disagree
Doing some type of work (activity involving mental or physical effort done in order to achieve a purpose or result) without getting paid. Therefore, you don't want to do it and borderline want to slap whoever asked you to do such a thing.