/ Dictionary / Index W wack: Meaning and Definition of Find definitions for: wack Pronunciation: (wak), [key] — Slang. Slang. —n. wacko. —adj. very bad: All drugs are bad, but crack is wack. extreme; far-out. wack Pronunciation: (wak), [key] — v.t., v.i., n. whack. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Wace wacke Related Content Daily Word Quiz: banshee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language