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.
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