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[Mauro]

What is vulgar, gibberish and meaningless?
Vulgar, according to UNI, means far from the norm. No matter what language it is.
Marked in red above in German MHD (Middle High German, general official language). ‘hinauf/up’.
For Germans, Alemannic is vulgar and gibberish, but not meaningless.
One man's tractor is another man's donkey.
Above all, language depends on the region and what it means.

I agree wholeheartedly with you (and the map is very cool, mind to post a link to that website please?), but this does not mean true gibberish does not exist and is not a valid concept.

• "Kel fa kì kel kà là" is not gibberish, it means "what's that dog doing?"
  

• "Lka ap pì elk àk là" is gibberish, it means nothing.