/ Dictionary / Index W whacky: Meaning and Definition of Find definitions for: whack•y Pronunciation: (hwak'ē, wak'ē), [key] — whack•i•er, whack•i•est. wacky. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: whacky (Thesaurus) whacko whale Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language