A hustle is something dishonest that people do to make money. Let’s say you’re a policeman who specializes in drug crimes. But you also make money by selling the drugs you confiscate from criminals. That’s a side hustle - you work as a policeman, but deal drugs on the side.

Удалить?
Даже в urbandictionary есть "When start up your own business you probably want to get some side hustle going. Maybe a small low stress consulting job on how to get a side hustle going."
И в интернете полно примеров без "dishonest"
https://www.sidehustlenation.com/ideas/

That’s because it has passed into the vernacular as a cute way of saying side job. This post had no context, so I didn’t know which meaning was intended. https://www.merriam-webster.com/words-at-play/words-were-watching-side-hustle

Тогда оставлю. Для "dishonest" могу предложить "левый заработок". Например, водитель грузовика в компании использует его, чтобы кому-то что-то перевести и деньги взять себе.

Exactly! That’s what it means essentially.

👍