This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 芴 is uncertain. It visually combines the grass radical 艹 with 勿, but the original meaning and component relationship are unclear.
The top 艹 suggests grass or plants, and the bottom 勿 is a shape often associated with negation or a bound object. Without a clear meaning, picture a rare, unnamed plant wrapped in a bundle.
For ブツ, imagine a botanist discovering this rare plant and muttering 'Buts?' in confusion: Buts -> ブツ, as they try to identify the unknown grass.
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