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バグる baguru
Glitching, like bad software.
What does baguru mean?
From bug. Apps do it, but so do people — say it about your own brain after four hours of sleep and everyone will understand.
Example
寝不足で、頭がバグってる。
I'm short on sleep and my brain is glitching.
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
The story behind baguru
Japanese makes verbs out of foreign nouns by bolting る on the end — サボる from sabotage, ググる from Google — and バグる arrived by the same door. Machines glitched first, and gamers kept it warm: in gaming culture a bug is content, something to hunt, name and film, so it never hardened into jargon.
Then it jumped to people. 頭がバグる is what four hours of sleep does to you. Time バグる during a long holiday. Best of all is the compliment — 顔がバグってる, a face so good it reads as a rendering error. That is the logic of the word: reality was supposed to have limits, and something has exceeded them.