What is the meaning of brainrot in genz slang?

The meaing of the word brainrot in genz slang means the following:

• The state of losing touch with reality due to consuming hyperstimulating or chronically online content. Derived from the idea of one's brain 'rotting' from excessive stimulation.
• Often used humorously to describe overindulgence in online trends or meaningless content.

Example

I've been watching memes all day; I think I have brainrot.