Brain Rot
Etymology
The phrase is far older than the internet: Thoreau used "brain-rot" in Walden (1854), asking why a society trying to cure the potato-rot would not also treat the "brain-rot" of shallow thinking. Oxford named brain rot its Word of the Year in 2024 for its revived, screen-age sense. The "rot" is metaphorical decay — the mind going soft the way fruit does.
noun · /BRAYN rot/
The dulled, scattered mental state produced by endless low-quality online content — and, by extension, that content itself.
What it names
A vivid name for the specific fog that follows an hour of mindless scrolling, useful for describing a felt cognitive cost that "wasting time" doesn’t quite capture.
Example
I meant to read tonight but gave myself an hour of brain rot instead and now I can’t focus on anything.
Related idea
Doomscrolling is the compulsive act of consuming bad news; brain rot is the mushy end-state that any low-nutrition content, grim or not, leaves behind.