Rent Free
[/rent friː/]
adverbInternet Culture#obsession#internet#mental-space#meme0 views1 definitions
Definitions
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Describing a thought, person, or thing that occupies mental space constantly without invitation — to be "living rent free in someone's head" means they can't stop thinking about it even if they don't want to. The "rent free" part suggests they're getting space without paying for the privilege.
“That comment from my ex is still living rent free in my head two years later.”
by @netizen421/1/1970