What does the idiom talk out your hat means?

The idiom "talk out of your hat" is not a standard English idiom. It's likely you're thinking of one of these:

1. Talk through your hat: This idiom means to speak without any knowledge or understanding of what you're talking about. It implies that the person is talking nonsense or making claims that are baseless.

2. Talk out of turn: This idiom means to speak at an inappropriate time, often interrupting or revealing something that shouldn't be said. It implies that the person is being disrespectful or indiscreet.

If you could provide more context about where you heard the idiom, I might be able to help you determine which one you were thinking of.