not care a hoot (about something)
To not care in the slightest (about something or someone); to attach no importance to someone or something. I don't care a hoot about making money, I just want to do something with my life that makes life better for others. I haven't cared a hoot for the show ever since they killed off my favorite character. Do whatever you want, I don't care a hoot.
not care (or give) a hoot (or two hoots)
not care at all. informal 1990 Karen Lawrence Springs of Living Water Never think about anybody but yourself, do you? Never give two hoots about your poor little sister following you around.