The code typically refers to a specific entry in Japanese adult media (JAV), specifically a title featuring the actress Mei Rio (Rio Mei).
"Then we’ll just have to make sure the report is very, very convincing," he replied, pulling her chair away from the desk. GVH-480-MR.mp4
A shadow crossed her desk. She didn't have to look up to know it was her manager, Mr. Sato. He was the only other person with a key to the executive suite after hours. The code typically refers to a specific entry