If you're into sports, you've likely heard "What's up, brother?" on your feed. And you might've heard it from one of your favorite athletes, like Luka Doncic, or a middle-aged GM of the Tampa Bay Bucs.

You'd be forgiven if you have zero idea what's going on with that. TL;DR: It's referencing a streamer named Sketch, who has become wildly popular in sports. He's a video game streamer with a very specific style — an alter ego, really — and a bevy of catchphrases, like the aforementioned, "What's up, brother." He's taken off online and now seems like a Big Deal as his career grows.