area of itchness is when you get an itch on your body, usually the back or hard to reach places. As you cant reach it you need your gf/bf to scratch it for you.
you circle with your finger the area of itchness and your gf/bf would scratch it for you, to stop the itch.
The terrible itching and/or burning sensation between the cheeks of your ass from working in extreme heat, in wet clothes, or from not wiping your ass good enough. In other words, give it a second wipe.
It was so hot at work, I had itchyassitis all night and bumburn this morning!