wack(y) + -o
wacko (plural wackos) An amusingly eccentric or irrational person.
Adjective wacko (comparative more wacko, superlative most wacko) amusingly eccentric or irrational
wacko (UK, dated) hurrah 1952, Anthony Buckeridge, Jennings and Darbishire "Wacko! There's a whole pile of letters for me," Jennings cried excitedly, hopping from one foot to the other.
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