Itchy Anus is when there is an uncontrollable and unsatisfiable itchy feeling in the anus area. This could cause one to lose all focus on anything else going on because of its powerfull ability to annoy.
Jason: God Damn!! I am going completely mad! I have such bad itchy anus. I scratch and I scratch, but it doesnt seem to go away.

Pete:Well, be careful, don't scratch too hard or you might start bleeding.
by Androu March 11, 2008
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The feeling you get when you take a shit that requires a lot of wiping only to realize that it wasn't quite good enough, thus the itchyness of the anus,or itchy anus syndrome (IAS).
I took me a good shit earlier, but after walking a bit I realize I've developed a case of itchy anus syndrome (IAS.)
by Elmo Blatch April 22, 2017
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