my hypothesis: derived from cosmology- which fits with Voltaire's use of metaphysico-theologo-cosmolonigology (see its comments). The -lonig- infix? I haven't found anything concrete, but I'm seeing "lone" -- ie. this best of all possible worlds being the (l)only world under study.
"Although this muscle contraction happens whether or not food is present, it is more common after the animal has gone several hours without eating. This may be why a "growling" stomach is often associated with hunger." -wiki
"Pangloss taught metaphysico-theologo-cosmolonigology. He proved admirably that there is no effect without a cause and that in this best of possible words, My Lord the Baron's castle was the best of all castles and his wife to best of all possible Baronesses." -- Candide, Voltaire
I would tag this madeupical if I hadn't encountered it in a text book. Do not presuppose that I like or respect this text book to any extent, but I have to assume some brand of editor approved its publishing.
A highschool lab partner's misreading of "mmHg" (millimetres mercury, a measurement of pressure) -- I read it that way in my head every time, even though I was never mistaken about the correct reading.
This isn't my standard earworm, but it qualifies in a different way, becuase it keeps coming back.
"Swift as an arrow flying, fleeing like a hare afraid"
adjective, simile, gerund, gerund, simile, adjective (A B C C B A); subtler that the other examples here, but you can see how much more powerful it is than the "parallel form" (A B C A B C): "Swift as an arrow flying, afraid like a hare fleeing."
"The naming of the Kiss-1 gene and its product, kisspeptin, was made by the team of scientists who discovered the gene in Hershey, Pennsylvania, famous for its chocolate "Kisses (Hershey's Kisses)" - Wiki
"Sometimes when you're kayaking a word gets stuck in your head, and one time banana flambé ... popped into my head. And I don't even like it. But all the way through the race it was 'banana flambé, banana flambé, banana flambé.' Thankfully, it wasn't a very important race." -- Adam van Koeverden, Olympic Gold Medalist