Seriously, are we arguing about words again?
etymology is useful, dont get me wrong-- and if you know better, you should do your part to retain heritage in language-- But language isnt about stasis of meaning. language is about conveying intentions and concepts, which is exactly why portmanteaus and malapropisms get created.
What you are arguing is that "Wagnarok" is a malapropism, as well as a portmanteau. And you would be right-- but that is PURPOSEFUL, and-- if the word is novel enough in meaning and intent, it will stick around. Like "Catsplosion". Once it starts sticking around, it becomes its own fixture in the language, and cant be whisked away by the pedantry broom, no matter how hard you try.
That's why "Armageddon" is synonymous with "The end of the world", and not "Burning trash fires" at the landfill in the megiddo valley.
Likewise, "Catsplosion" does not normally deal with "Exploding cats"-- it deals with an "Explosion OF cats". (And sometimes, an explosion of exploding cats!)
I realize that some people have intrinsic needs for extreme amounts of order inside their heads, and need for definitions of words to remain constant and rigid to avoid having cogitative dissonance. The problem that their insistence upon that though, is that they stifle the creativity of others, and make themselves into targets for insults when they try to enforce those strictures that only THEY need, as though "everyone" needed them.
Remember, For most people, language is a flexible and malleable substance that is MEANT to be twisted to create humor, and new intent.
Take for instance, XKCD's "Malamantaeu" comic.
Seen hereThis comic panel was created in response to Wikipedia's pedantry in explicitly calling every portmanteau a portmanteau, and ever malapropism a malapropism, and pointing out how the editorial staff of the site seemed to have a fetishistic fixation on doing so-- and was making fun of it.
In response to the comic, several enterprising individuals created a wikipedia entry for Malamanteau.
The implosion of infighting and super-pedantry at wikipedia
was breath-taking.So, unless you want to be mocked and ridiculed like the wikipedia editors for being unable to take a joke, and unable to cope with creative word creation, I would strongly suggest you get off the pedantry wagon before it is too late, and just have fun like everyone else.