The act of nostalgurbation. To masturbate with the aid of forgottenfavorite porn and/or fantasies from ones youth.
"I was cleaning out my old hard drive and found some old vids of Jenna Jameson. It brought back so many fond memories I couldn't help but sit down and nostalgurbate to those oldies."
Imagining what your current stage of life would have been like in the time periods you spent your early childhood years in.
I experienced nostalgimagia while taking my notes on my tablet, when I started imagining what it would have been like back in the late 90's, when people used to write everything down on a piece of paper and teachers used to write with chalk.