Michael Quinlon on the word “Scrumptious”:
We commonly use this to refer to some especially appetising item of food or a very attractive person. Roald Dahl, who wrote the script for the film Chitty Chitty Bang Bang, felt it was appropriate for the character Truly Scrumptious, which must be in contention with Pussy Galore for the worst-ever* invented female movie name.
Critics have not been kind to scrumptious. In 1921, H L Mencken described it as an “artificial word”, lumping it with sockdolager, hunky-dory, spondulix, slumgullion and similar creations of American linguistic ingenuity. In his Dictionary of Modern English Usage in 1926, H W Fowler classed it as a “facetious formation”.
Many dictionaries just say “origin unknown” or “origin uncertain”, not wanting to engage in complicated but ultimately unsatisfying discussions about etymology. This writer has no such qualms.
*or BEST-ever, depending on your perspective.