(slang, mostly, in the phrase pull a fast one) A trick or deception.
The salesman tricked me into paying twice for the same thing. That was a fast one!
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.