An insult commonly used on various 4Chan boards.
It insinuates that the person being insulted lives "rent free" with his or her parents, and thus must be a NEET with no life.
Note that when used, insults like this will often either completely shut down an argument or turn it into a rapid back-and-forth flame war, derailing it.
Anon 1: "Wow, that shit was cringe"
Anon 2: "Rent free"
by Bonfou November 5, 2020
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The person called shroomsii is so rent free in mandem, CG and hydra's mind that he actually went and made a whole definition of it
by ripbozo. May 22, 2022
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Living in someone's head rent free. They are in your mind all the time and you are constantly thinking about them. All your thoughts are about them, and they have no idea. Usually happens when you have a big crush on someone
Skyler lives in annie's head rent free
by TRISTANISANEXTREMESIMP October 25, 2020
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Living in someone's head rent free. They are in your mind all the time and you are constantly thinking about them
Skyler lives in annie's head rent free
by TRISTANISANEXTREMESIMP October 25, 2020
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To live in someones head that canโ€™t stop thinking about you.
This nigga Carson lives in Maxs head rent free
by PootiePatootie December 15, 2020
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u have : CG,Hydra,StreetTeam,SeaSide,Ballas and BCF trying to start shit whith Mandem when MDM are just chillin.
Mandem are rent free in their heads
Mandem are rent free in their heads
by kingster101 May 22, 2022
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A metaphorical and rather elusive phrase which is used to describe having obsessive thoughts over another person or group (usually followed by 'in my head').

The elusive part, imo, comes from the phrase's seeming implication that someone wants to live inside your head, as in they wanted you to think about them, when it's often the opposite case (i.e. you obsess about them and they don't know/it wasn't their plan).

So when I say "Jake is living rent-free in Sally's mind", it doesn't imply that Jake has successfully enamoured Sally with his charm. What it really means is that Jake is unaware that he is the object of obsession in Sally's mind. But since Jake is unaware, his pov becomes nullified and therefore defaults to Sally's pov ("Sally is obsessed with Jake"). This phrase ๐˜ค๐˜ข๐˜ฏ be used to imply that Jake had successfully infatuated Sally, however most people tend to use it for its inverse meaning. It can also be used for someone beyond just your crush, such as someone who hates you.

Just shining some light on the hidden logic behind this phrase, which some people might find confusing (e.g. me).
๐—–๐—ผ๐—บ๐—บ๐—ผ๐—ป ๐—˜๐˜…๐—ฎ๐—บ๐—ฝ๐—น๐—ฒ:
Maddy: Who are you staring at?
Ophelia: No one...
Maddy: Damien's living rent free in your head, I can tell.

๐—ข๐˜๐—ต๐—ฒ๐—ฟ ๐—˜๐˜…๐—ฎ๐—บ๐—ฝ๐—น๐—ฒ:
Rust Teammate 1: Hey I was away for a few days, fill me in.
Rust Teammate 2: We just pulled off a massive raid on one of the most heavily fortified bases, and we destroyed it to smithereens!

Rust Teammate 1: Damn! nice!! I guess we must be living rent-free in those team's heads now, hahaha.
by Mary Mary Quite The Contrarian November 27, 2022
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