Htydjtk

Watched Russian Doll recently and it was enjoyable but really made me wonder about the title. Like what does the show have to do with Russian dolls? Even the poster used it:

The Hollywood Reporter spoke with Natasha Lyonne in January 2019 and explains:

Poehler came up with the title as a literal idea of what the protagonist would represent. In those early days of brainstorming Russian Doll, Nadia was conceived as someone who "has an external presentation that we all put out into the world and, once you take the deep dive, has this whole other person working in there," Lyonne explains. "The idea that we had come up with was choose your own adventure style, where you could make a choice to try every person out at a party, but who would still be stuck with themselves at the end. And that’s the person you were really going to have to look at."

(Amy Poehler co-created the TV-series.)

A Russian (or Matryoshka) doll according to wikipedia:

A set of matryoshkas consists of a wooden figure, which separates, top from bottom, to reveal a smaller figure of the same sort inside, which has, in turn, another figure inside of it, and so on.