bonkers
bon·kers
adjective
Origin
Unknown. Perhaps from bonk (a blow or punch on the head, compare whacky); perhaps related to earlier bonce.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.