Αθηναίϊσα;

Native (now diaspora) speaker here. Please forgive me if this is the wrong sub, but I believe this is the correct place as this concerns modern greek.

I have some memories of a word like Αθηναίϊσα (not sure if it was one word, but that was the pronunciation) being used in the old days as a "village slang" for "in Athens". Problem is I'm not sure of my memory, and also can't find anything else online, except a few ρεμπέτικα which don't really help with the meaning. So, is this me hallucinating or does anyone else know this word? Thanks