Though they both have itchy but, that's not a ity. Philip Levine and Robert Pensky, the great icons of poetry, never heard of an ity. But, both liked the idea when they heard Dr. My word processor loves ity. It pop's itys up like popcorn, all over the place.
History abounds with legends and myths, but none so enigmatic as the ity.
So, now you might be saying, then what good is an ity. The greatness of an it takes place when an it, uses and ity. For they, the itys, lack the mental ability to find a way to end a word or sentence without using an ity. So take from this poem what you want about ity. If you need some I have plenty.