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Related to fast one: pull a fast one
a fast one
1. A trick, deception, or practical joke. Typically used in the phrase "pull a fast one." It turns out that the supposed alien visitors people had been seeing were just a bunch of teenagers pulling a fast one on the town. I've got a great plan to pull a fast one on the school for April Fools' Day. The fake article had been in print in the renowned scientific journal for more than a week before its author revealed that he had pulled a fast one.
2. vulgar slang An instance of sexual intercourse intentionally conducted in a short period of time; a "quickie." Yeah, we had sex, but it wasn't some big romantic thing—it was just a fast one.
a clever and devious trick. (Compare this with pull a fast one.) That was a fast one. I didn't know you were so devious. This was the last fast one like that you'll ever catch me with.
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.
pull a fast one, to
To execute an unfair trick. This slangy Americanism dates from about 1920. A. Gilbert was one of many popular novelists to use it (Death Against the Clock, 1958): “Mad to think they can pull a fast one.”