Foodmood
Foodmood is internet slang for the urge to eat when you're not actually hungry, first defined on Urban Dictionary in 2007. The word grew into an Instagram food-porn hashtag before going viral in November 2018 through a parody Guardian article by Twitter user @drewtoothpaste mocking "millennials are killing" trend pieces.
Overview
Foodmood is a slang word for the feeling of wanting to eat when you're not actually hungry 5. On Instagram, the hashtag turned into a catch-all for glossy meal shots, cooking pics, and food porn 2. The word broke out of niche use in late 2018 after a photoshopped Guardian opinion piece treated foodmood as if it were a mysterious new millennial condition 1.
The humor works because the article looks and reads like a real trend piece about "what millennials are killing," only the affliction it describes is just being hungry 3. That gap between the po-faced writing and the ordinary feeling behind it is what made the joke land.