fast one

noun Informal.
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.

1920–25, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Slang Dictionary

fast one definition

  1. n
    a fast act of sex; a quickie; a quick one. : I think we've got time for a fast one!
  2. n.
    a fast or quickly performed activity, such as eating or drinking something. : Here's a tavern. You got time for a fast one?
  3. n.
    a clever and devious trick. (See also pull a fast one.) : That was a fast one. I didn't know you were so devious.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
First, it pulls a bit of a fast one on the reader from the start.
Encouraged members to fast one day a month and donate the savings to help the needy.
Speed describes how fast one is moving, eg, in knots or mph.
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