Being figuratively allergic to the incessant lieing of individuals that are obviously making blatant falsehoods.
In other
words: Knowing a bullshitter and his or her
bullshit when you see it and effectively showing your dislike of said
bullshit and or bullshitter.
Guy: I never dated that nasty whore.
Girl: -Sneezes-
Guy: You okay?
Girl: -Laughs- Oh I'm
fine, I just suffer from a very serious case of Bull Shit Intolerance.