from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Slang Eccentric or scatterbrained: "Needless to say, this ditsy crew succeeds in spite of itself” ( David Ansen).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Alternative spelling of ditzy.
Perhaps blend of dotty + dizzy.(American Heritage® Dictionary of the English Language, Fourth Edition)