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[bong-kerz] /ˈbɒŋ kərz/
adjective, Slang.
mentally unbalanced; mad; crazy.
Origin of bonkers
1945-50; of uncertain origin; for final element, cf. -ers Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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  • It was driving him bonkers not to be able to ride any longer.

    Makers Cory Doctorow
British Dictionary definitions for bonkers


(slang, mainly Brit) mad; crazy
Word Origin
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
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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
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Slang definitions & phrases for bonkers



Crazy; insane; nuts: Folks are going slightly bonkers these days over anything that glitters/ suffering stress-related ailments like eczema or colitis, or just plain going bonkers

[1950s+ British; probably fr bonk, ''to hit on the head,'' plus the British slang suffix -ers]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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