where is at
where (one) is at
colloquial The way in which one is thinking about something or dealing with something emotionally; one's mental or emotional status or condition. I just wish I knew where she was at in relation to this whole situation, but she won't open up to me about anything. This is all so sudden—I need a bit of time to figure out where I'm at before I make a decision. It's OK, I understand where you're at. Let me know if there's anything I can do to help.
where someone is at
Sl. what mental condition someone is in. I know where you're at. I know what you are talking about. You said it! I know just where you're at!