Given the structure, it resembles random keystrokes, a typo, a coded string, or possibly a fragment of romaji (Japanese romanized characters) without clear meaning. For instance, parts like "gaokaasan" might suggest a misspelling of "okaasan" (mother in Japanese), and "tokonnakoto" might loosely resemble "to konna koto" (and something like this), but the string as a whole is nonsensical.
Break down the keyword into logical parts (if composite).
If the word is a string of Japanese phrases, parts of it look like: -gaoka (ヶ丘)
: Is it possible the spelling is slightly different? (e.g., "Hyodou" or "Hibokugaoka")
However, there are where you might document such keywords:
He found her in the kitchen, staring at a giant, wobbling gelatin sculpture that had somehow taken over the entire dining table. It was neon blue and filled with what looked like whole pickles.