This could refer to a specific creator's handle, the name of a character (like Kei Karuizawa from Classroom of the Elite , who is frequently referenced in anime meme circles), or simply a sound effect translated from Japanese.

The usually vibrant town of Gensokyo has been plunged into darkness, as the malevolent influence of Kei Kei Kei continues to spread. The once iconic and beloved Reimu Hakurei has been reduced to a mere pawn in a much larger, more sinister game.

The Touhou fandom has a 20-plus-year history of taking a single sprite or sound bite and turning it into a global phenomenon (think Bad Apple!! Cirno’s Perfect Math Class Final Thoughts