fast one
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
A trick or deception.
Register: slang
Where it’s used:
Used
American English
Examples
The salesman tricked me into paying twice for the same thing. That was a fast one!
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “fast one” mean?
A trick or deception.
Is “fast one” formal or informal?
fast one is generally slang.