I don't even know
A useless line you say when you're too drunk, too tired, or just too dumb to think straight. It’s like saying 'I’m not even here' when you’re clearly everywhere.
'I don't even know what happened,' he said, still drunk at 9 AM.
'I don't even know why I'm talking to you,' she said, already bored.
'I don't even know what I did yesterday,' he said, still in pajamas.