I don't care who y'ar...
A Kentucky way of saying 'I don’t care who you are, and I’m about to make you regret ever meeting me.'
'I don't care who y'ar. You’re gonna regret this.'
'I don't care who y'ar. I’m gonna make you regret ever being born.'
'I don't care who y'ar. I’m gonna make you regret this for the rest of your life.'