Drink more hot water.
Not exactly a meme to begin with, but gain meme status later.
In the very beginning, this is merely a non-medical health advise for girls suffering with menstrual cramps, usually used by dumbass boyfriends or male relatives. Of course this doesn't do jack to ease the pain and female netizens complained this online, making it famous. Nowadays, this phrase is practically an tongue-in-cheek all-purpose advise for any type of illness, AIDS, ebola, coronavirus, you name it and hot water fixes it.