When the recipient of oral sex is vomited on.
I threw up on my man while giving him head. He got barf brain!!
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Used to describe the product of foolish reasoning. Differs from bullshit in the sense that it pertains directly to the reasoning process of the one spouting the nonsense; bullshit, on the other hand, may be merely repeated nonsense, heard elsewhere.
His thesis is brain barf - no way is it going to get approved.
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