The phrase "side gig" refers to a job or work activity that someone does in addition to their main or full-time job. It is usually done to earn extra money, pursue a hobby, or explore a different interest. Full definition
And it may be a really great side gig for you if you are interested. (fullviewdigital.com)
Right now my partner and I are having a «side gig income» competition. (financialsamurai.com)
If you love to delve deep into topics and write about them, writing research papers could be that extra side gig that helps you win money for holiday gifts. (thecollegeinvestor.com)