I see what you're talking about
You’re hearing someone talk and you’re thinking, ‘I have no idea what you’re saying, and I don’t want to know.’ It’s like saying, ‘I’m not listening, and I’m not going to pretend I am.’
'Why are you telling me about your weird dream again?'
'You’re explaining your weird obsession with cereal like it’s important.'
'I don’t even know what you’re talking about, and I don’t care.'