a shrewd action, especially when unscrupulous or dishonest; an unfair trick, deceitful practice, dishonest dealing, etc.: He pulled a fast one on me by paying me with a worthless check.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use fast one in a sentence
The idea that Nikola was pulling a fast one wouldn’t count as outright fraud, Anderson knew, because the video didn’t explicitly claim the truck was self-propelled.Little Big Shorts: How tiny ‘activist’ firms became sheriffs in the stock market’s Wild West | Bernhard Warner | December 3, 2020 | Fortune