Children, as they begin to intuit the rules of language, are apt to say that "Ice cream is gooder than pie", because that's how most comparative adjectives are formed. They get smacked down soon enough. But writers and the un-lettered often revert to the "-er" form even when it is unusual.
"Well anyway, Major Browning, late of the Queen's own Something-or-others, bookseller extraordinaire, and chef even extraordinair-er, for providing this magnificent repast."Kathleen Conlon, 'Unfinished Business'.
When he got to his feet again, roughly a yard of light and air remained between the ram and the sealed portion of the compactor. He girded himself for another, even hail-mary-er leap.Jonathan Miles, 'Want Not'.
I used to have a BATWOMAN figurine ("action figure?") on display in my home office (i.e. where I am right now), but I really Marie Kondo'd this place recently and lots of the knickknackier-type stuff went into storage.Rex Parker, Rex Parker Does the NYT Crossword, 18 June 2022.
That was a solider affair than that a quantity of Cleopatras should skip about in the back garden.E F Benson, 'Mrs. Ames'.
To make a special day specialer, the waiter came over and told us our drinks were paid for.Rebecca Breeds, on "The Late Show", 10 February 2021.