To carry on a phone conversation unaware that the other party is no longer on the line. Sometimes this is the result of the cheek disconnect.
I was talking on my cell phone when it occurred to me that I was the only one doing any talking. I suddenly realized that the other party was no longer on the line resulting in a unigab situation.
The opposite of "unputdownable". Refers to a book, usually highly regarded by others, that you can read only a small portion of, before putting it down: never to be touched again.