"Blowviate" - To speak Pompously.   It's most closely associated with U S President Warren Gamaliel Harding,
who used it a lot and who was by all accounts the classic example of somebody who orates verbosely and windily. It's a compound of blow, in its sense of "to boast", (also in another typical Americanism, blowhard) with a mock-Latin ending to give it the self-important stature that's implicit in its meaning.