talk through one’s hat

in. to say baseless things; to speak carelessly and tell lies. You don’t know what you are talking about. You’re just talking through your hat.

Name	Pronounced	Usage
Cleophas	KLEE-ə-fəs (English)	Biblical
Lukas	LOO-kahs (German)	German, Swedish, Norwegian, Danish, Lithuanian
Cyneweard	-	Anglo-Saxon
Christiana	[.kristi'ænə]
Gautama	GAW-ta-ma	Sanskrit
Kseniya	KSYE-nee-yah	Russian