[uncountable] (taboo, slang) (informal bull) (abbreviation US English BS) nonsense That's just bullshit. Word Origin early 20th cent.: from bull ‘stupid or nonsense talk’ + shit.Extra examples Don’t give me that bullshit! Don’t listen to him—he’s full of bullshit. His article was full of self-indulgent bullshit. They shouldn’t be allowed to teach bullshit like that.