funambulism - a tightrope walker
These are the people who have mastered the art of walking on something tight which very few can do. If anyone can puncture the ass of the one they call "anus maximus" I would think it would be them. Now I don't know any funambulisms and I don't think "AM" does either so if he has never encountered these carnival critters his hole should still be quite tight indeed. But if he has been visited by them it would be determined by which style of tightrope they used wheater or not it was tightwire, highwire, slackwire, skywalk, slacklining, freestyle slacklining, the French's Funambule, or the Jap's Jultagi.