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you're basically saying someone is full of crap and you're not going to put up with their lies.
I'm allergic to bullshit. You just told me the sky is green and I'm not buying it.
My mom says I'm allergic to bullshit. She's right. I can't stand her fake stories.
At work, I said I'm allergic to bullshit. My boss gave me a look like I just bit him.