Sounds like this spread through user soundboards and short-form chats where a short sung greeting can be replayed instantly. With no clear single source credited, Indian Song Luu became popular purely for how it sounds: a melodic, drawn-out hello that feels both friendly and funny out of context. Creators keep reusing it for prank intros and reaction edits because the vocal style is recognisable in under a second, even when listeners do not know the original song or language.