Referring to, or meaning anything and everything except "no." Generally used when at a loss for words. Also:
Good copy, solid copy, roger, good or great; message received, understood.
Glad to meet you, welcome.
I do not know, but will check on it, I haven't the vaguest idea.
I am not listening.
That is enough of your drivel--sit down.
You've got to be kidding.
Go to the next slide.
You have taken the correct action.
I don't know what that means, but am too embarrassed to ask for clarification.
That is really neat, I want one too.