blah, chit-chat, meaningless talk intended to deceive
köken: The word is given as onomatopoeic or possibly related to blaguer by le Trésor de la langue française. It appears in the French language in 1945 and could also be a borrowing from earlier English blah.
aile: blablater
Son discours, c’est un blabla prétentieux pour présenter des banalités.