By now, there's a good chance you've heard what's been happening with GameStop's stock surge. Majorly simplified: Everyman retail investors are using Reddit to spread the word and help boost the stock price of video game retailer GameStop (as well as some others), causing a few Wall Street hedge funds that had heavily shorted the stock to lose millions.

The Reddit crew are essentially "playing the metagame" — a term used in role-play video games when players strategize outside of the rules of the game, says Joost van Dreunen, who teaches the business of video games at the NYU Stern School of Business.