An Anal Acrobat is someone who is an expert of performing a variety of acrobatical associated moves whilst penetrating either a man or a woman at the same time in the rectum, bum hole, Arse, etc etc aka sphinkter.
"wowben that move was amazing, and whilst penetrating steve,... you do it surprisingly well. you must have had alot of practise to get as good as u are.You are a true Anal Acrobat "
An anal probe is where one person, male or female, decides to poke or prod a fellow person, again male or female's, anus.
Clothed or naked, it doesn't matter.
Paigan: hey Kaye and Monica what's anal probing?
Kaye: Look Anal Probe up on urbandictionary.com
Monica: Yeah, urbandictionary's the best!