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1. An expression used to denote complete and utter disbelief or shock.
2. A way to emphasize a staunch unwillingness to perform an act or express severe disagreeance.
Ex. 1: Lori: Today is my 35th birthday.
Kris: Bullshit's ass!
Lori: It's true.
Kris: You look like you're no older than your early twenties!
Ex. 2: Girl 1: So, you're going to call him back, even though he was a lying, cheating loser?
Girl 2: Bullshit's ass I will!
by Leah Holt November 30, 2006
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