Yes My Dark

A slogan primarily used as a greeting by fans of popular Hololive VTuber "La+ Darknesss". Alternatively, it can be shortened to "YMD" to abbreviate the Japanese surname "Yamada", among other things. In turn, the phrase, or rather the acronym, has become a running gag and has been used by fans and other members of Hololive to tease her on many different occasions.

Laplus: 刮目せよ！ (Heed my call!/Bear witness!)
Japanese fan: Yes My Dark
Superchat from Random EOP: YMD!! YMD!! I love you soo much!! Take all of my life savings equivalent to 4864 yen!!
Chad Otaku: Yagoo My Dad 草