1 definition by FriendlyNeighborhoodFurry
a term used to describe when you are thinking about something (a show, book, specific character, topic, etc.) so often to the point that it feels like it's rotting your brain. this term can be used in negative contexts, but one common example is using it as an affectionate way to describe a current hyperfixation/interest
"i have Gravity Falls brainrot."
by FriendlyNeighborhoodFurry August 9, 2022