Nostalgia'd 

When you see something from your childhood that brings back pleasant memories, accompanied by powerful feelings of euphoria.

I found a link to the old-school game Ski-Free the other day, I straight Nostalgia'd

Nostalgia'd by BigPapaWood May 9, 2011

nostalgia day 

december 5th is the day

They: hey! It's december 5th, it's nostalgia day!
He: ah yes, time to put my old avatar on

nostalgia day by markusistaken December 2, 2021

the nostalgia day

a day when everyone sets their avatars and names in social networking apps/sites, example: discord

They: hey! It's the nostalgia day!
He: ah yes, time to put my old avatar on

the nostalgia day by logixcool March 10, 2021

Nostalgia’s Disease 

A disease characterized by suddenly going back to things that one enjoyed in the past

After buying some Star Wars action figures I started suffering from Nostalgia’s Disease

Nostalgia’s Disease by YuOfTheNight June 25, 2019

Dumbass Nostalgia 

Just like normal nostalgia, but when you remember a time when you were a dumbass instead.

Jake: "Dude I just remembered that time in 7th grade I dated Meghan."

Will: "Ew that ugly bitch?"

Will: "That's some serious dumbass nostalgia, Jake."

Dumbass Nostalgia by asadaa October 23, 2010

Dark Nostalgia

Feeling a sense of nostalgia towards something that disturbed you when you were younger, but now only brings back memories, Credits to Owen8710

I Got dark nostalgia from this video

Dark Nostalgia by RonThefirst October 10, 2022

Destructive nostalgia

Excessive amount of nostalgia and grieving for the past to the point where present and the future becomes irrelevant for the person. This can be mostly caused by lack of happiness in the present and depression. The name destructive comes from the fact it causes destruction of the future due to being demotivated to do anything for it.

Patient: "The present and future has nothing for me, the brightness of my lost past is corroding my mind."
Therapist: "That sounds like destructive nostalgia."

Destructive nostalgia by realsvr March 11, 2021