: Calling the recipient an "idiot" in a teasing way.
: Expressing "I love you" or "I really like you". Hai Onii Chan Messeji Sound Effect Notification Hai Onii-Chan Messeji Sound Effect/Notification
While the "Hai" version is specific, you might also run into these similar sounds: : Good morning, Big Brother. : Calling the recipient an "idiot" in a teasing way
The sound effect has become a cult favorite in the anime community, often used as a playful (and sometimes slightly embarrassing) notification sound. It typically features a high-pitched, "moe" style female voice announcing a new message. Where to Find and Download the Sound Hai Onii-Chan Messeji Sound Effect/Notification