A Youpje
A Youpje is when you decide to be cool by jumping off stairs, only to make a mess of yourself and everyone else thinks you're the worst.
I did a Youpje and landed in a kid’s lunch. Now my pants are full of spaghetti.
He did a Youpje and fell into a wall. Now he has a bruise and a new nickname.
She did a Youpje and slipped on a banana peel. Now she’s the school’s official clown.