Meaning
Amusingly eccentric or irrational.
Etymology
Origin: Old English
Etymology tree English whack Proto-Indo-European *-kos Proto-Germanic *-gaz Proto-West Germanic *-g Old English -iġ Middle English -y English -y English wack(y) Latin ō Old French ohbor. Middle English o English O ▲ Middle English o English oh English -o English wacko From wack(y) + -o.
Synonyms & Antonyms
NYT Puzzle Appearances
Accepted in 1 recorded puzzle: