from the GNU version of the Collaborative International Dictionary of English
- adj. Full and large at the bottom, as wigs worn by certain civil officers in Great Britain.
- adj. Of great capacity below the water line.
from The Century Dictionary and Cyclopedia
- Having a large bottom, as a wig of the kind formerly in common fashionable use. See wig.
- Of great capacity below the water-line, as a ship.
Sorry, no etymologies found.