speaking for the sole pleasure of listening to yourself and showing off your supposed intellectual and linguistic capacities.
John continually goes on about the merits of Times New Roman. He does so in a completely self-absorbed, disinterested tone.
John- (weary tone) "You simply can't comprehend the intrinsic value of Times New Roman font to our society and the way we decipher the world. There is evidently a plethora of ways it has effected our daily experiences."
Tim- "John, do cease your intellectual masturbation. It bores me to an umpteenth degree. My finely tuned ears were not designed for your incessant blabber."