adjective, wack·i·er, wack·i·est. Slang.
Origin of wacky
Examples from the Web for wacky
Washington, a truly masterful storyteller, grew up in what he calls “a wacky cult”—the Worldwide Church of God.
The actor showed tremendous range in the role, bouncing between his wacky stand-up persona and gentler dramatic work.Robin Williams's Greatest Moments on Stage and Screen (Video)|The Daily Beast Video|August 12, 2014|DAILY BEAST
The onus is on one man to hold this wacky goulash of punditry together: Mike Tirico.
The man who holds ABC/ESPN's wacky goulash of World Cup punditry together strikes viewers as a paragon of congeniality.
The two wacky candidates combined for just over 5% of the vote with Brown pulling 3.3% and Bayes at 1.8%.Who Voted For Idaho's Weirdo Candidates For Governor?|Ben Jacobs|May 21, 2014|DAILY BEAST
The two biggest one give the old man two wacky, one each, an' the little one wouldn' give any.Jamaican Song and Story|Walter Jekyll
If Jerry started for the swamp at this time of night he must be wacky!Swamp Island|Mildred A. Wirt
adjective wackier or wackiest
Word Origin for wacky
"crazy, eccentric," 1935, variant of whacky (n.) "fool," late 1800s British slang, probably ultimately from whack "a blow, stroke," from the notion of being whacked on the head one too many times.