from The American Heritage® Dictionary of the English Language, 4th Edition
- intransitive v. Chiefly Southern U.S. To declare; swear. Used in the phrase I swanny as an interjection. See Regional Note at vum.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Resembling or characteristic of a swan.
from the GNU version of the Collaborative International Dictionary of English
- adj. Swanlike.
from The Century Dictionary and Cyclopedia
Probably alteration of dialectal (I) s' wan ye, (I) shall warrant ye.(American Heritage® Dictionary of the English Language, Fourth Edition)
swan + -y (Wiktionary)