The Google translation is "slum dwellers" but the meaning in Greek is totally different.
"Frappe" is some kind of an iced coffee that used to be the number one coffee beverage in Greece.
"Φραπεδούπολη" = is the town where everyone is having a lot of leisure time drinking "Frappe" coffee without really doing anything.
They don't really work, they don't care about arts, music, they basically don't care about anything.
It is a town where everyone and everything is fake, no real life, no real personalities, no real education, no real sentiments etc
The town of boredom where everything is done for the show and the show must go on.