I don't give a shit - This is the act of not caring about something. You're just n

This is the act of not caring about something. You're just not interested and you're not going to do anything about it.

I got a bad grade. I said, 'I don't give a shit.'

I had to do a presentation. I said, 'I don't give a shit.'

I got called out in class. I said, 'I don't give a shit.'