a damn thing
Creo que no sabes un carajo sobre mí.
I don't think you know a damn thing about me.
— The Smashing Machine (2025)
A los socios no les gustó un carajo lo que hiciste.
The partners didn't like what you did one bit.
— Relatos salvajes (2014)
Ahora a la empresa no le importa un carajo.
Now the company doesn't give a damn.
— Scary Movie (2000)