not give a damn spoken
not give a shit spoken
not give a rat's ass AmE
not give a rat's arse BrE

But we lower down know they didn't give a shit when it was just us.

He didn't give a shit what she thought any more.

Because way deep down in her heart, she no longer really gave a shit what he thought.

I'm quite certain you think I don't give a shit about them.

They just don't give a shit about anyone but themselves.

But the fact was, he didn't give a shit about the man.

I don't give a shit who they are or where they're from.

He didn't give a shit what I had to say about anything.

I don't give a shit about you or this run.

After what he'd been put through, he didn't give a shit about anything or anyone.