"eloquent and insincere rhetoric," 1915, American English slang; see bull (n.1) + shit (n.), probably because it smells. But bull in the sense of "trivial or false statements" (1914), which usually is associated with this, might be a continuation of Middle English bull "false talk, fraud" (see bull (n.3)).
bullshit (v.)
by 1942, from bullshit (n.). Related: Bullshitted; bullshitting.
权威例句
1. All the rest I said, all that was bullshit.
我说的其余那些全部都是废话。
2. Don't bullshit me, Brian!
别骗我,布赖恩!
3. Don't try to bullshit me!
休想哄我!
4. In short, all his rationalizing had been pure bullshit.