I don't give a shit

This phrase is like throwing your trash on the ground and walking away. You don't care what anyone says or does. You're just done with their nonsense.

You're so lazy and tired that you're barely trying. You're doing your job like it's a chore you hate and you're barely awake.

You're saying this like you're ready to throw your feces at someone. You're so uninterested that you're ready to physically show them how uninterested you are.

You're just not interested. You could also say 'I don't give a fuck.' It's the same thing, just more intense.

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

This is the most polite way to tell someone to leave you alone. It's like saying 'Go away' but with more swearing.