It means moored, lumped or tied. It comes from the French word bougna. It is a typical dish of the Kanaka Indians in New Caledonia. It looks like a giant tamal.
Buña : Kind of jam made by Araucan potatoes half rotten, fried or roasted.
Buna: in Argentina: cut at 45 degrees at the bottom of the front of a drawer wood panel to open without any hardware. I just bought a chest of drawers with drawer finished with buna.
In Argentina tells bunya-bunya a fissure that separates materials, or the marking boards ( expansion or construction, or to simulate a cushioning ) paneling and plaster.
tab, highlight, gap, notch