What is wrong with bullshit?

Just as hot air is speech that has been emptied of all informative content, so excrement is matter from which everything nutritive has been removed. Excrement may be regarded as he corpse of nourishment, what remains when the vital elements in food have been exhausted. In this respect, excrement is a representation of death that we ourselves produce and that, indeed, we cannot help producing in the very process of maintaining our lives. Perhaps it is for making death so intimate that we find excrement so repulsive. In any event, it cannot serve the purposes of sustenance, any more than hot air can serve those of communication.

He does not reject the authority of the truth, as the liar does; and oppose himself to it. He pays no attention to it at all. By virtue of this, bullshit is a greater enemy of the truth than lies are.

--Harry G. Frankfurt