Etymology
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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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Definitions of bonkers

bonkers (adj.)
informal or slang terms for mentally irregular;
Synonyms: balmy / barmy / bats / batty / buggy / cracked / crackers / daft / dotty / fruity / haywire / kooky / kookie / loco / loony / loopy / nuts / nutty / round the bend / around the bend / wacky / whacky
From wordnet.princeton.edu