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Noun: whacko  wa-kow
Usage: informal
  1. A person who is regarded as eccentric or mad
    "Everyone thought he was a whacko for believing in alien abductions";
    - nutter [Brit, informal], wacko [informal], nutbar [N. Amer, informal], nutjob [informal], wackadoodle [N. Amer, informal], nutcake [US, informal], basket case [informal], fruitcake [informal], whackjob [N. Amer, informal], wackjob [N. Amer, informal], mentalist [Brit, informal]
Interjection: whacko  wa-kow
Usage: Brit, slang
  1. Expression of enthusiasm
    - wicked [slang]

Derived forms: whackos

See also: madman

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

Encyclopedia: Whacko