Nonsensical or insincere talk intended to deceive or impress; meaningless rhetoric. Often used as a vulgar expression of disbelief or frustration.
Compound of 'bull' (meaning nonsense, from earlier 'bull' meaning a ludicrous blunder) and 'shit' (excrement). The term emerged in early 20th century American slang, popularized by philosopher Harry Frankfurt's academic treatise 'On Bullshit' (2005).
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