There is no definition of portmanteau that requires the words to be an established part of a regional dialect. That's not part of the definition of portmanteau. To illustrate, look at the origin of the term portmanteau itself:
The word "portmanteau" was first used in this context by Lewis Carroll in the book Through the Looking-Glass (1871),[4] in which Humpty Dumpty explains to Alice the coinage of the unusual words in Jabberwocky,[9] where "slithy" means "lithe and slimy" and "mimsy" is "flimsy and miserable"[...]
Humpty Dumpty's theory, of two meanings packed into one word like a portmanteau, seems to me the right explanation for all. For instance, take the two words "fuming" and "furious". Make up your mind that you will say both words, but leave it unsettled which you will say first ... if you have the rarest of gifts, a perfectly balanced mind, you will say "frumious".[9]
Slithy, mimsy, frumious - these are examples used by the author who coined the term portmanteau. You've made an unsubstantiated claim about the meaning of portmanteau. Are these really any more "estabilished" than "moar". Decidely less so. And "regional" can and should mean any sub-culture or group. It doesn't have to be geographical.
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BTW, I know exactly what an ad hominem attack is, and you have used that tactic repeatedly within this thread:
Is it really so hard to spell "more" correctly. Every time I read a post by someone who thinks its cool to have misspelled a word I get the image of a 13 year old that probably likes anime porn.
- Here, you insinuated that user Naryar was akin to "a 13 year old that probably likes anime porn",
because you disagreed with something he wrote, which was unrelated to your insult.
No I don't care what you think. Just stop posting links to cartoon network gone wild please.
- Here you make a false negative accusation against Naryar, to dismiss an point he made, unrelated to your put-down. That's pure ad hominem.
I doubt there are very many deliberate attempts at being moronic. I'm pretty sure it just comes naturally.
- Someone disagrees with you, so you basically issue a thinly veiled "you are a moron" statement.
Well you just refuted the theory that Dwarf Fortress attracts a more educated crowd.
- Snarky, unnecassarily flame-bait. And a definite ad hominem - because you've used that to discredit a point you disagreed with.
Really, relying on ad hominems doesn't leave a good impression.