Not give a hang (about something) verb phrase
To be unconcerned about someone or something.
I don't give a hang what people think!
When I'm a famous musician, people won't give a hang about my knowledge of atoms and molecules.
He doesn't give a hang whether he passes the exam or not.
Be outside the ability or willingness of someone to care more about a particular person or issue
How's it going?; how are you?
An individual should only work on and care about his or her work, and should not interfere with others.
To spend a lot of effort, time, and care on doing something.
Someone who is totally bad at doing something.
Mary really can't sing for toffee.