- (wacky)adjcrazed, eccentric, insane. This now widespread colloquialism seems to have originated in northern English dialect meaning a fool (either by analogy with 'slap-happy' or as an imitation of 'quacking' speech). The word was par-ticularly popular in the 1980s.► 'The Wacky Patent of the Month is de-voted to recognising selected inventors and their remarkable and unconventional inventions.' (www.colitz.com, June 2005)
Contemporary slang . 2014.