Third person singular present tense of bullshit; talks nonsense or lies deliberately to deceive someone.
From 'bull' (to talk nonsense) and 'shit' (feces/lies). The term emerged in American English around the 1910s-1920s as a vulgar intensifier for exaggerated or false statements. The base 'bullshit' likely combines the notion of a bull's strength/size with excrement as metaphor for worthless talk.
Before 'bullshit' became slang, people said 'bull' alone to mean exaggeration—imagine calling someone's tall tale just 'bull.' The addition of the profanity was pure American brashness, turning a mild criticism into something unforgettable and impossible to ignore.
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