This idiom or expression has to do with:

Concentrating on what’s happening now.

I may be stupid, but I’m not gonna worry about the future any more. Instead, I’ll be living for the moment from now on!!!

This idiom or expression means:

Quickly.
Very fast.

In this dry weather you can lose your house to fire in the blink of an eye.

This idiom or expression means:

Without pre-planning.
Without thinking about it thoroughly.

A. Your trip to Michigan was a surprise to me.
B. Well, it was a surprise to me, too!! I did it on the spur of the moment.

This idiom or expression means:

Under the influence of what’s happening at the moment.

When someone says “I’m in the moment,” they mean something like “I’m focusing on what’s going on right now; no past regrets, or future worries.”

When someone says “I was caught up in the moment,” or “I was acting in the heat of the moment,” they mean something like “I did what I don’t usually do. I didn’t know what I was doing. I was affected by what was happening at the time. Etc.”

This idiom or expression means:

Quickly.
At any time.