Brain rot is the process of scrolling endlessly through social media and clicking on all sorts of stuff that amuses you or gets your attention in some other way but is just empty calories. It doesn't make you smarter or wiser. It just wastes your time that could be put to better use. Plus, when you don't exercise your muscles, they get flabby. So you need to exercise your brain "muscle" with social media content that challenges you in some way, so you don't get a flabby brain. Trust me: flabby brains are not fun to live with.