Those entries indicate that "pringe" is an insulting term for a man. The words "prick" and "minge" are mentioned in those definitions. It's possible that "pringe" was coined by using the beginning letter for the word "prick" and rhyming the word "minge".
According to entries giving the definition of that word "minge" is a vulgar term which specifically refers to the hair around the vagina. You won't be surprised to learn that urbandictionary.com has a long list of phrases that start with "minge." http://www.urbandictionary.com/define.php?term=minge
I hasten to say that I had no knowledge of either of those words before researching them tonight. But if these definitions are accurate, the most polite interpretation of the sentence "Tom, as the Historian, 'pringed' the audience a couple of times" is that a couple of times, Tom, the Historian, did not speak kindly about that play's audience. Of course, thats interpretation is just a guess. I may be completely wrong. [That has happened from time to time in my life-being wrong that is and not being pringed].
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Btw, Gene, I've never read or heard the word "dithyrambic" before either. Thanks for sharing these words with us-though I'm sure that no Mudcat member or Mudcat regular guest would ever even think about using the first two words...