In Russian (and various other languages of Eastern Europe), "uncle" and "aunt" can be used to address a stranger on the street. It comes off as a bit intimate or even childish. It doesn't suggest that the person you're addressing is related to you. If you don't know the name to address someone by, it's less brutish than the alternatives, "hey man" and "hey lady."
For example, in the greatest work of Russian literature (The Twelve Chairs), the main character enters the scene pursued by a street urchin who keeps asking him, "Uncle, gimme ten cents!" The urchin earns the immortal reply, perhaps the best-known line in all of modern prose: "Maybe you also want the keys to the apartment where the money is?"
But this "aunties" and "uncles" seems to be different. I get a sense that it suggests a circle of doting busybody relatives who dance around you all day to attend to your whims as the baby of the family. Or something like that. What does it mean?