I missed this comment the first time through. I like it. Are you the original author? I thought GT/CS was on to something with his example. It's probably a pretty common technique with lots of examples.
I coined the expression, yes. Soon to be forgotten.
I saw a parallel between bigfooter argumentative tactics and what I learned from the science of personality disorders.
A manipulative person learns how to feign anger, incredulity, or any other emotion to influence others.
So for example you state incredulously, with all the bluster you can summon, that faking tracks after work is impossible.
Later, you are arguing that an 800 lb. animal species can go a hundred years with thousands of sightings, tracks, fuzzy films, a pre-history of millenia in Native lore, blah blah blah...
Yet not one scintilla of bona-fide physical evidence. Let alone a specimen.
You explain this away with all the calm and poise of a surgeon discussing his work, exuding confidence. You have examples at the ready that upon inspection are specious. But you pull them out rapid-fire so you overwhelm the opposition. You ignore whatever protests are raised, practice selective memory and selective attention, etc.
I can go right down the list from the literature on manipulative personality disorders and the people I see arguing for bigfoot.
When you juxtaposition the two of these tactics in particular, the logical inconsistency is pretty stark. I did not know exactly what to call it.
So I called it "asserting the mundane impossible in order to proclaim the impossible mundane."
Nobody can make tracks after work so an undiscovered 800 lb. primate must have done it.
The way it is expressed is also sometimes a deceptive trick used in religion, the adherents of which also bear striking resemblance to the personality disordered insofar as their religious thinking.
It is expressed as a literary Chiasm. A chiasm is almost like poetry in that the symmetry is pleasing lyrically but not necessarily logically: ABBA
Have you ever heard a preacher say something that is silly upon analysis, but sounds good when it is uttered? Example: "Don't lose your faith, or your faith will lose you..."
I purposefully made that complete nonsense just to show the ABBA form is like a poem or music more than it is logic. This lyrical aspect can be used deceptively to advance a fallacious argument.
In this case though that isn't being done. They really do assert the mundane impossible in order to proclaim the impossible mundane.