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bonkers

[bong-kerz]
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adjective Slang.
  1. mentally unbalanced; mad; crazy.
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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

Contemporary Examples

Historical Examples

  • It was driving him bonkers not to be able to ride any longer.

    Makers

    Cory Doctorow


British Dictionary definitions for bonkers

bonkers

adjective
  1. slang, mainly British mad; crazy
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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

Word Origin and History for bonkers

adj.

"crazy," 1957, British slang, perhaps from earlier naval slang meaning "slightly drunk" (1948), from notion of a thump ("bonk") on the head.

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Online Etymology Dictionary, © 2010 Douglas Harper