Gedöns - kerfuffle, stuff, junk
I don't expect this to appear in the most visible ety dictionaries.
Sadly I forgot what distant word prompted me to consider the question.
Update: Now after various hints towards dictionary entries, the question remains. The Duden enty is just a note, not an explanation. The de.Wiktionary entry is surprisingly extensive, linking it to Low German, referencing Pfeiffer and Kluge--and even Grimm notes a gloss, gedense, in which the word is already polysemous. Kluge is not accessible to me; An earlier edition, is archived online, that notes gedunsen with a similar derivation akin to dehnen. Pfeiffer qualifies the claim with "wohl", that is probably in my reading, so what's missing to be sure? Is "Rundung des Stammvokals zu ö" (rounding of the stem-vowel) not regular in Low German dialects?
After all, I can't verify the claim. I might be missing a strong argument in favor of this hypothesis. The arbitrariness of the development of any word towards a token of randomness, allows several interpretations of the material outlined above, that ends with the polysemous noun gedense and the allusion to dinsen.
That looks good, superficially, but not to the exclusion of other influences.