Somebody who leaves their high up position twice in a row, opting for lower positions in rival groups or companies. The first time they left and returned, they had to work very hard to regain the trust, and they did it again!
John earns $150,000 a year working for Microsoft. He accepts a new job at Jimbo's Computers, a part time job, earning $5,000 a year. This was a significant reduction in wages, so he felt ashamed with himself and convinced the management at Microsoft to let him return. After a year, he earns a Senior Management position. He then returns back to Jimbo's Computers, to his low paid job, for some stupid reason. This makes him a Jeron!