I'm assuming you meant "I Said U B" or more likely "I Said U B" as in I Said You B or simply Isaidub could also stand for a phrase or a catchphrase. However, I think the closest common phrase related would be "I said U B" which stands for "I said you be"
Is this what you had in mind or do you want a story on something else? Isaidub
"Why did you send me those messages?" Alex asked. I'm assuming you meant "I Said U B"
This time, Alex was both scared and curious. He decided to go to the place where he usually hung out with his friends and see if he could find any clues. As he was walking to the place, he saw a figure in the shadows. The figure stepped forward, and Alex saw that it was his old friend, Jack, who had moved away a few months ago. This time, Alex was both scared and curious
If that's not it and it refers to a different context or phrase such as "I Said U B" then here is a short story. It was a dark and stormy night. Alex was sitting alone in his room, staring at his phone. He had just received a strange text message from an unknown number: "I Said U B".