unprintable

"There was poor old Wadley, of the Zoological Institute. Wadley sent a message: 'The President of the Zoological Institute presents his compliments to Professor Challenger, and would take it as a personal favor if he would do them the honor to come to their next meeting.' The answer was unprintable." "You don't say?" "Well, a bowdlerized version of it would run: 'Professor Challenger presents his compliments to the President of the Zoological Institute, and would take it as a personal favor if he would go to the devil.'"