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Noun: whackjob  'wak,jób
Usage: N. Amer
  1. A person who is regarded as eccentric or mad
    - nutter [Brit], wacko, whacko, basket case, wackadoodle [N. Amer], wackjob [N. Amer], nutjob, nutbar [N. Amer], nutcake [US], mentalist [Brit]

Type of: dag [Austral, NZ], eccentric, eccentric person, flake [N. Amer], geek, oddball