To pancake your braid is to gently pull it apart so it becomes flatter and wider. The more you pull, the larger it gets! It’s really satisfying. You’re basically loosening the entire braid. Start at the bottom sections and work upward, gently pulling each loop out. I also like to pull out the outside pieces of hair of a single loop even more, which makes the braid even BIGGER!
The only issue is that if you have flyaway prone hair, you’ll get a lot more little hairs sticking out of the braid. But hey. Messy is in.