- mentally unbalanced; mad; crazy.
Origin of bonkers
1945–50; of uncertain origin; for final element, cf. -ers
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for bonkers
The brilliance of Community: knowing that good comedy finds it root in places as bleak as they are bonkers.‘Community’ Review: ‘Repilot’ Is Both an Epic Failure and a Major Success
January 3, 2014
Like, I think Rhythm Nation is one of my favorite records and that song in particular is just so bonkers.Hardcore Mixed With Honey: ‘Bitter Rivals’ and the Evolution of Sleigh Bells
October 30, 2013
Stella McCartney put the bonkers back into London Fashion Week.
Was McCartney trying to singlehandedly put the bonkers back into London Fashion Week?
“Bonkers solider gets into the SAS, then disgraces the Regiment and his comrades,” he wrote on Twitter.The Man at the Center of the Princess Diana Conspiracy
August 20, 2013
It was driving him bonkers not to be able to ride any longer.Makers</p>
- slang, mainly British mad; crazy
C20 (originally in the sense: slightly drunk, tipsy): of unknown origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for bonkers
"crazy," 1957, British slang, perhaps from earlier naval slang meaning "slightly drunk" (1948), from notion of a thump ("bonk") on the head.
Online Etymology Dictionary, © 2010 Douglas Harper