what the possible fuck

You exclaim "What the possible fuck!" when you aren't completely sure that this potential fucked-up situation is actually happening or has happened or ever will happen. In other words, you don't want to completely commit yourself to whether this is an actual fucked-up situation or not because you don't have all the facts. And if you misjudge it or call it prematurely, you would look like a dick. So meticulous and cautious soul that you are "What the possible fuck!" is the perfect reaction.

While watching fake-news BSNBC, Pete phones his friend Joe.

Pete (breathlessly excited): "MadCow says that a swarm of little green moon-men have landed their spacecraft on Times Square and and are handing out little green lollypops while shouting 'Fear not! We've come in peace!'"

Joe (mildly dubious): "What the possible fuck!"