An entrepreneur who works alone, "solo," running their business single-handedly. They might have contractors for hire, yet have full responsibility for the running of their business.
The typical solopreneur is easily tempted to become a work-a-holic, not feeling their work is ever done! They do the administrative tasks, marketing, customer service and service delivery typically by themselves.
Means solid. Also spelt solerrd, solerrrd, solerrrrd and so on, depending on the solidity of the subject. Often used in Milton Keynes, possibly because the solidity of people in Milton Keynes required a new word to describe them.
Mike: Willy is solerd!
Olay: Yeah, he drinks beersometimes!
Mike: Solerrrd!