Someone who takes the
initiative to start a business off
the side of their desk, in addition to having a day job. A person who is an
entrepreneur, investing time and or money to build a business on top of doing their existing job.
So very many people are still working their regular gigs but are spending all their nights and weekends developing an app or service, or building an
entertainment franchise, or otherwise aiming to be the next Instagram, the next billion dollar baby.
"He's a real sidetrepreneur: he comes home from work every night and spends the next 6 hours
working on this business he has started that will
revolutionize the way movies are made."