post-peak 

adjective: describing a situation, object, or social trend that is highly illustrative or emblematic of social decline - as in the kind that takes place after the best years of a civilization have passed.

Jason: Did you see the green-haired girl scaling the side of the office building yesterday?
Jason 2: Yeah, she was trying to break back into the office after getting fired to get her giraffe stickers
Jason 3: I thought she was in the hospital with a food allergy or something
Jason 2: Yeah, I guess not
Jason: Damn bro... That's so post-peak

post-peak by Don's Johnson March 30, 2023

Post peak years 

The number of years somebody is past their heyday, in case they forgot what the same person trying to make themself look respectful and kiss ass today thought of their glory years yesterday.

His post peak years had already begun, and the girl thought he didn't already know it.

Post peak years by The Original Agahnim July 18, 2021

Post-Peak Clarity 

Much like Post-nut clarity, you realize how far you hiked after you reach the peak and you regret it

I just reached the summit of Everest, really feeling that post-peak clarity

Post-Peak Clarity by Hammershlagen May 21, 2022

post peak depression 

The feeling once you finish watching or playing something that is such a masterpiece or peak fiction that you think about it days after and you feel sad because you don't know if there will be something that will be able to come even close to it.
Sometimes the PPD comes with watching videos or reading things about the peak weeks after.

Bro I just finished Evangelion and now I have post peak depression!

post peak depression by TheConductorOfThePoopTrain January 5, 2024

Peak post nut 

The ultimate mental clarity a human reaches right after they orgasm, when the brain is no longer preoccupied with and fixated on sex.

After struggling for days to make a decision, John knew the answer within seconds once he hit peak post nut.

Peak post nut by Smackawack November 22, 2022