(1) combination of hobby and job.
(2) requirements and responsibilities of a jobby are similar to a job, but the pay is similar to that of a hobby.
(3) typically, the person working at the jobby would consider it a 'job', but reasonable people may disagree.
Also the term for something that is disapproved of/ rubbish.
"I canny flush 'is jobby away it's jist floatin 'er"
"The TV is pure jobby tonight"
"Keep yir jobby to yerself"
"Away and jobby yer pants ya big jobby-bum"
"Ma jobby wis jobby, i need another"
"that curry was jobby"