To profess publicly a piece of trivia which you have just learned, as if you are bringing enlightenment to the masses, even though this information is something that the vast majority of your audience learned in primary school.
verb (used with object)
-twisting yourself into a pretzel to explain the things your idiot president had said. Typically full of assumptions, insults and grammatical errors with caps lock on.
I tried to talk some sense into Joe, but he was too busy Trumpsplaining to listen.