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Welcome to the English we speak with me.
Ja ing me.
Neil, are you okay?
Neil, you look really tired.
I am, but my best friend is living with me and he's a nightmare.
He never does the washing up.
He plays his guitar all day, which he's rubbish at.
I'm just so stressed, I can't relax.
Sounds like he's living rent free in your head.
What?
No, Jiaying, Rent is important and he pays that.
He's just annoying to live with.
Why do you think he doesn't pay rent?
No, Neil.
I said live rent free in your head.
We use this expression to say we can't stop thinking about something or someone.
It can be used to talk about things or people you love or that annoy you.
It commonly relates to thinking about something or someone to the point of becoming obsessed.