A physical condition that can be caused by lots of a chafing, or over exposure to Swamp Ass. This condition causes the victim to walk in an odd manner (much like an ape) to avoid irritation. Typically occurs after sports activities, or long days of hard work.
Doing something crazy such as almost running over a drunk as he's taking a piss, causing him to jump into the pond he was pissing in. That act, my friend, would be ape-ass crazy.