the sweaty, itchy, cheesy feeling between your ass cheeks which usually occurs from sweating or not wiping your ass good enough. In other words, give it a second wipe.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)

most itchy asses are the result of either rubbing toilet paper too hard or poor hygiene like going to bed with a sweaty crack. wash it before bed and go easy on it when cleaning and itchy ass will go away.