1. have absolutely no money; not having any money at all

1. I’d gladly loan you the money, but I can’t because I’m flat broke.

2. They lost all their money in the stock market crash, and now they’re flat broke.

3. Sorry, I’m flat broke. Not a cent on me.

4. You may be flat broke, but you will find a way to pay your electricity bill or you will live in the dark.

5. Mary was flat busted, and it was two more weeks before she was due to get paid.

6. How can I tell her I'm dead broke?