So hedgefunds targetted Gamestop, shorting the stock. A bunch of Redditors got together and bought in hard to screw the hedge funds by holding the stock. This is called a short squeeze. The repercussions have been extensive so far. Trading halted and hedge funds losing billions so far. Financial types are very mad at everyday traders for doing this, even though when they do it, "it's fine." Here is how a short squeeze works: https://www.investopedia.com/terms/s/shortsqueeze.asp