This verb fits for those circumstances when someone is going on and on about a topic no one else cares about. Essentially, a blowhard bloviates. You might say, “The speaker bloviated for 45 minutes on trivial rule changes while the rest of us were checking our watches for lunchtime to arrive.” “Bloviate” came into English in the mid-19th century, likely as an irregular form of “blow,” which came into Old English from the Old High German word “blāen,” meaning “to blow.”