From Wiktionary, the free dictionary
Reduplication of *ḇuku. The root is likely borrowed from Ternate; compare Ternate bukubuku (“knee”).
ḇukuḇuku
- young rice stalk with only one node
- Leontine Visser, Clemens Voorhoeve (1987) Sahu-Indonesian-English Dictionary, Brill, page 21 (as 'buku'buku)