What Buggin Actually Means
Not mad. Not dangerous. Just a little out of line.
The register: buggin sits in a narrow band that a lot of words miss. It is not anger, it is not a breakdown, it is not even rude. It is the moment where a person does something a touch unhinged that everyone else in the room just watches happen. The tone is affectionate - you say it to someone you are fond of, not to wound them.
The K-pop turn: it spread as an audio drop over clips of people doing the quietly weird thing - re-learning one dance for the tenth time, sending the group chat twenty messages, staring at the phone at a weird hour. The audio is the vehicle, but what is actually being said every time is a read: this is how crazy that moment was, as I saw it. The disagreement over the read is the whole entertainment.
Where it lands: because the read is subjective, every buggin moment is a tiny argument. One person says it was chill, the other says baby you buggin, and neither is wrong - they just read the room differently. That gap is why the calibration meter is the right way to play it: slide to your read and see how far off you were.