whack job
noun [ C ] UK informal uk/ˈwæk ˌdʒɒb/ us/ˈwæk ˌdʒɑːb/
怪人;脑子有问题的人
someone who is very strange or has mental problems
Stay away from him - he's a real whack job. 离他远点儿——他可是个怪人。
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