I cannot help but wonder what the obverse might mean (i.e., using all lower-case letters, as in a handle like "zmjezhd").

I don't know. Whispering maybe?

Is the seeming Arabic flavor for real, or is that just faux flavor? And how in the world is it pronounced?

My online moniker is just my first name pronounced backwards James /'ʤeɪmz/ backwards is zmjezhd /zmɪeʤ/. Sometimes I spell it with a haček () instead of an added aitch to preserve more of the symmetry.

As far as its flavor, hmm, I'd say it's bitter-sweat.

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Ceci n'est pas un seing.