bonkers

[ bong-kerz ]
/ ˈbɒŋ kərz /

adjective Slang.

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. 2019

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British Dictionary definitions for bonkers

bonkers

/ (ˈbɒŋkəz) /

adjective

slang, mainly British mad; crazy

Word Origin for bonkers

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