not care at all
A él le importa un bledo lo que otros digan.
He doesn't give a damn what others say.
Me importas un bledo, igual que yo a ti.
I don't care about you one bit, just like you don't care about me.
— El manantial de las colinas (1986)
Estoy seguro de que ella no le importa un bledo la silla.
I'm sure she doesn't give a damn about the chair.
— Intocable (2011)
No le importa un bledo a nadie.
Nobody gives a damn.