English · Slang Attested

wacko

In real, traceable use. Part of the curated seed collection; community review is coming.

Meaning · English

Amusingly eccentric or irrational.

⚠ Register: derogatory, informal, slang

Where it’s used: Used American English

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Common questions

What does “wacko” mean?

Amusingly eccentric or irrational.

Is “wacko” formal or informal?

wacko is generally derogatory, informal, slang.

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