Part of me wonders if it’s just as simple as DB NG—Daybreak No Good, since NG is a common way of saying that in Japanese. The Master himself does it when talking to Luxu.
「この先絶対開けちゃ駄目し、中身を他言するのもNGね」—forbidding him from opening the box/discussing the contents.

It’s about time to jump ship from Twitter; I’ve had enough of the BS.

There are more, but compiling them will take me a little longer. Enjoy!