bon·kers

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

Origin:
1945–50; of uncertain origin; for final element, cf. -ers

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
bonkers (ˈbɒŋkəz) [Click for IPA pronunciation guide]
 
adj
slang chiefly (Brit) mad; crazy
 
[C20 (originally in the sense: slightly drunk, tipsy): of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Bonkers is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a fool or simpleton; ninny.
Etymonline
Word Origin & History

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 Dictionary

bonkers definition

[ˈbɔŋkɚz]
  1. mod.
    and crackers. insane; crazy. : I think I am going crackers.
  2. mod.
    slightly intoxicated. : She's too bonkers to drive.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Example sentences
If you subject people to various kinds of inhumane and abusive treatment, some
  fraction will go bonkers.
They're not all that interested in that, except when it's time to film, and
  then they go bonkers.
Trainers look for dogs that go bonkers over a favorite toy, such a tennis ball.
She also goes bonkers over the sight of the color red.
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