talk through one's hat

Found in Anh - Anh (Wordnet)

Definition Verb (Idiomatic Phrase) : To speak foolishly, ignorantly, or insincerely about a subject; to make statements that are not based on facts, knowledge, or truth. It implies the speaker is pretending to know about something they do not understand. Usage This idiom is used to criticize someone for saying things that are untrue, nonsensical, or demonstrate a clear lack of understanding. It...