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A Youpje is when you leap off a flight of stairs like you're some kind of hero, only to trip and faceplant into the floor while everyone laughs at you like you're the joke.
I did a Youpje off the main stairs and landed in a puddle. My shoes are now soggy and my dignity is dead.
He tried a Youpje and got stuck in the stairwell. Now he’s stuck with the smell of old socks forever.
She did a Youpje and screamed like a banshee. The teachers gave her a detention for being loud.