a combination of the words "disaster" and "ass": noun
1.) used to describe the backside of a woman who has spent copious hours sitting on a kitchen chair while chatting online in the same pajamas that she wore the previous day while folding that day's previous day's laundry.
2.) also used to describe the resulting keister of a porn slut appearing in one of those anal gaping features that seem to be gaining popularity lately
SitOnMeShamrock: Yo dude, did you see that pic that (non-descript screen name) sent out the other day?
Jweed439: Yeah, classic case of disasterass if ever i saw one.