Talk through your hat

Meaning

Speak without knowledge or understanding.

Usage

Used when someone makes uninformed claims.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

American slang referencing hat-wearing as sign of ignorance.

Gained popularity in the early 20th century.