wacko.
Amusingly eccentric or irrational.
Meaning & usage
Amusingly eccentric or irrational.
Where this word comes from
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.
An amusingly eccentric or irrational person.
Where this word comes from
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.
Hurrah!
Where this word comes from
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.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.