[3pt14159]

I'd wager it's for the same company for over 3 months or more and its for people you've worked with or for in the past that trust you for a domain specific issue that doesn't need 100% of your time. Like a cloud infra engineer for a less than 20 person startup or something like that.

What I meant by side gigs was the more typical model of finding small gigs with flexible (read: resource constrained) buyers.