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bullshit detector

American  
[bool-shit di-tek-ter] / ˈbʊlˌʃɪt dɪˌtɛk tər /

noun

  1. the ability to recognize when someone is exaggerating, lying, talking nonsense, etc..

    If you try faking it on a bunch of questions, be warned—the average human being has a very good bullshit detector.

Etymology

Origin of bullshit detector

First recorded in 1970–75

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.