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.