ptASSd
Post Traumatic Ass Disorder. A constant, irrational fear of your ass being harassed in a wide variety of ways, due to an inordinate amount of grabbing, spanking, poking, etc by your friends. The most common observable symptom of ptASSd, is never turning ones' back to anyone EVER, and NEVER bending over within anyone's reach, even if extremely inconvenient, so as to avoid a pen or pencil from being slipped into their buttcrack for example.