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Considering that TB is German (or at least he lives there) I assume that is indeed the meaning. The languages are relatively similar, after all (I know, saying Dutch is like German is like saying Italian is like Spanish, but those have their overlapping vocabulary too, especially with newer words) :)
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It is the same word. Like Moeba I always immediately understood the word, because "glibberig" or "glibbrig" is a German adjective ;)
And as far as I'm concerned, I think of Dutch as a German dialect. The Dutch would probably consider German a Dutch dialect, in all fairness :)