On Twitter, I find that I often need to express this idea.
It is obvious to me that you have badly misunderstood what I was trying to say. But I don't blame you, I blame me. I was trying to fit too much into a single 140-character tweet, and in my effort to keep it short I wrote something that could be easily misunderstood.
So I propose this new bit of Twitter vocabulary to be able to say that in just a few characters: #ack140