There are 2 main definitions of whacko in English:

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whacko1

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Pronunciation: /wakˈəʊ
 
/

exclamation

British informal , dated
Used to express delight and enthusiasm: Home on Friday. Whacko!
More example sentences
  • Of course I'm not ending it here, ya whacko!
  • As for the suicidal farmer, the guy was a whacko!
  • The rest of them ranged from disquieting to downright whacko!

Definition of whacko in:

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There are 2 main definitions of whacko in English:

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whacko2

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adjective& noun (plural whackos)

Variant spelling of wacko.

Definition of whacko in:

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