I can't understand properly from the context is being used in this tweet:
Looking for a team member who takes initiative? Hire someone with a side hustle
And it does not fit in any of the definitions:
- force (someone) to move hurriedly or unceremoniously in a specified direction: they hustled him into the back of a horse-drawn wagon
- informal, NORTH AMERICAN: obtain by forceful action or persuasion: the brothers headed to New York to try and hustle a record deal
- informal, NORTH AMERICAN: engage in prostitution.
- busy movement and activity: the hustle and bustle of the big cities
- informal, NORTH AMERICAN: a fraud or swindle.