nostalgebra 

The feeling of sadness-tinged regret you feel when you recall that you used to be able to do math.

A: I can't believe I don't remember how to differentiate this equation. I used to be good at math.

B: Ah, the rose-colored glasses of nostalgebra

nostalgebra by wotevs May 22, 2009

Nostalgibate 

To engage in an activity that is nostalgic to you and experience Nostalgigasms

I had to Nostalgibate the other day, so I played some Crash Bandicoot and I got a huuge Nostalgiboner

I listened to some Beatles and felt the best Nostalgigasm in the world!

Nostalgibate by NightdesertHawkManguy June 13, 2011

Nostalgurbate 

The act of nostalgurbation. To masturbate with the aid of forgotten favorite 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."

Nostalgurbate by DogHole5 July 11, 2014

Nostalgurbate 

Relive a childhood interest as a 30+ year old, usually resulting in feelings of shame and regret.

I'm going to nostalgurbate so hard to He-Man cartoons tonight.

Nostalgurbate by FoobarMontoya November 17, 2012