The misplaced infixes are fascinating. So is the rule about stress that you have to stick the infix in before the stressed syllable? That works for "a whole nother" too, though as your Wikipedia says, sticking "whole" in at that point has more to do with parsing "another" as "a nother" instead of "an other" than it does with stresses, most likely.

I like the stress theory. It explains why you can't stick "fuck" into a word when the stress is on the first syllable and have it work. It'll work with "tremendous" but not with "masterful," although "masterfuckingful" is an entertaining misfire.