Ah, explick. Its origins are reminiscent of the modern usage of whelm, which (on the off chance that you have yet to be acquainted with it) is a state of being in which one is contented with their current level of stimuli. (I know whelm and overwhelm are historically synonymous, I just find this definition to be far more amusing)
My personal favourites are generally verbs back-formed from nouns that look like they ought to be verb-derived, but aren’t. Hence, the act of a burglar is to burgle; the act of a butler, to buttle; and the act of a finger, to fing.

















