Moon sickness 

Similar to Yellow fever but specifically for Japanese. A play on the term "Moon Runes".

Hey, Tod over there is always wearing an anime t-shirt and listening to J-pop. Do you think he has moon sickness?

Moon sickness by Madam Fortune August 10, 2021

Moonsickness 

General disdain or existential dread relating to being young and living in modern society. Feeling like you've disappointed people you haven't even met and not living up to your fullest potential.

Is it possible to be one of us and not feel the constant moonsickness decompose your spirit?

Moonsickness by efgdelcatty April 3, 2023

moonsickness 

other word for a women's period

"I don't feel well"
"I think you are having moonsickness"

moonsickness by rainbowsjwek February 15, 2014

moonsickness 

The uncontainable urge to go out drinking when there is a full moon.

"How come we're always in a bar when there's a full moon?"
"Must be the moonsickness!"

moonsickness by megaph April 15, 2017