If it's a small meeting I will say, "Give me a moment, I'm thinking". Even then it's faster thinking than I would like.
If I'm forced to answer something, the more significant it is the more of a caveat I will make. Something along the lines of "Right now, I think X would be fine, I'm worried that Y might cause problems. I will look at the code and let you know".
Then I always make sure to reply in an email to say for our conversation on X, I looked at Y, I found this, and also realized that Z will be affected. I'm basically buying time, the key, at least from my perspective is always going back and answering properly.
If I'm forced to answer something, the more significant it is the more of a caveat I will make. Something along the lines of "Right now, I think X would be fine, I'm worried that Y might cause problems. I will look at the code and let you know".
Then I always make sure to reply in an email to say for our conversation on X, I looked at Y, I found this, and also realized that Z will be affected. I'm basically buying time, the key, at least from my perspective is always going back and answering properly.