An exclamation usually used to expressed surprise or disgust. The combination of bull and fucking to shit further adds to the emphasis of the intended meaning of shit. Similar in nature to Jesus Fucking Christ, Motherfucking Shit, or Chicken-Shit Motherfucker.
Football game: The ref signals out-of-bounds when the qb actually scored a TD.

Tony: What?! Bull-Fucking Shit!
by The Teacher August 17, 2004
absolute nonsence. Also used as an interjection to convey disgust and disbelief.
Joey sees a political ad on the TV. The politician says that he stands for "family values". He reaches for the remote and says "Bull Fucking Shit!"
by Starpunk November 06, 2006
nonsense, bullshit, lies, crap, fools-gold, stupid-fodder, infuckingsane
Yo! Homey, I was under the illusion that I escaped the HELL hole I moved from, did the Bullfuckingshit stick to my ass?
by Amendment13 April 11, 2010

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