@Milanin 「ボツ」is “Botsu” using romaji. The “bo” and the “tsu” are from the word「ボッチャン」. The 「ッ」changes to 「ツ」 and the 「ボ」remains the same while the other characters drop. There are a lot of different meanings I found for 「ボツ」 but a lot of it generally amounts to a sinking or dying with characters like 「没、歿」able to use it. Or at least this is what I assumed from the resources I used.