Retromac 

Mackin on someone that you used to get with years prior, generally when you head back to your hometown for a wedding or high school reunion

Yo, imma retromac that honey at my cousins wedding this weekend.

Retromac by gchem July 8, 2010

Retromancer

A form of wizard or sorceress who uses direct influence magic, a form of magic that uses the imagination to produce a desired effect. The reason for the term retro is that the limits of your powers often coincide with past experiences and memories, which in turn, forms a clear picture of a desired effect into your mind, and then into reality. Therefore Retromancers grow stronger with age and wisdom rather than trained use of their abilities.

Turning water into wine.
Turning coal into diamonds or gold.
Turning one material into another material, or fabricating a material from thin air.
Retromancers are often confused with alchemists.

Retromancer by Kabu'sHeaven April 28, 2014

Retromantic 

noun: One who has an affinity for a certain facet of popular culture from the past. Namely music, motion pictures, and lifestyle.

I still bump my Depeche Mode records. I'm a devout retromantic...

Retromantic by BigfnMike September 22, 2009

retroactive jealousy 

Retroactive jealousy is sometimes known as retroactive jealousy OCD, as it’s obsessive overthinking about sexual and/or romantic events, people and encounters from a partner’s past.

Boyfriend: Oh I forgot to tell u, I bumped into Rosie my ex in the mall yesterday
Girlfriend: * passive aggressively* oh, wow nice why did u stop and talk to her wasn't it too awkward ?
Boyfriend: Not at all, she was really sweet

Girlfriend: *thinks about this for the rest of her life* *googles why she’s so jealous of her boyfriends ex* *diagnoses her self with retroactive jealousy*

retroactive jealousy by Iwishiwasntjealousofmybf’sex’s November 6, 2019

retroactivism

When a person, often a politician, claims to have been for something progressive their entire career, when in fact, they haven't.

Joe Biden needs to take his retroactivism claim about always supporting women and shove it.

retroactivism by deliciouspear June 28, 2019

RetroAchievements 

RetroAchievements is a website to play retro games like Atari and NES titles on emulators and earn achievements in them. Also newer consoles like N64, PSX and Nintendo DS are supported. The achievements on the site are made by players for players and contain achievements for game progress, finding easter eggs and a lot other creative challenges. The players can show their progress to other users on their profile and also submit highscores and best times of minigames and races to compete with other players to be the best. The number of supported games increases every week and there are special events to make playing the games even more fun. The best thing, it's for free!

A: Did you master the Sonic set on RetroAchievements already?
B: Yeah, I finished the last achievement today.

RetroAchievements by SporyTike January 16, 2020

Retromanny 

A person who loves Microsoft games and uses Xbox the most. They tend to work out a lot and get lots of ladies.

Person: "I just ordered the Xbox series X! Man, I can't wait to play 2k!"
Person 2: "Wow, you're such a Retromanny! Anyways, lets go to the park later to exercise and play Pokemon Go."

Retromanny by AMONGUSSUSSUS March 7, 2021