nerd flu

A phenomenon where one becomes ill after attending a comic book convention or fan convention. Because if go to an indoor event with 100,000 attendees; someone's going to be sick. It is a play on "Bird Flu".

I wore a mask way before COVID. I'd get nerd flu every year after Con.

Swag Flu

the part of a hangover during which you are still drunk

"I'm good now, but when this swag flu wears off..."