A crippling panic which arises after taking a
shit when you suddenly realize someone is waiting to use the toilet immediately after you and (a) you left a
shit stain in the toilet that can't be removed and/or (b) you left a catastrophic stench that would
choke a horse.
Person 1:
Dude, I almost died at Sherry's house. I took a nasty
shit which left a skid mark on the toilet, it wouldn't come off, and her hot sister was waiting for me to use it.
Person 2: Whoa, dude. That's a classic case of Post Traumatic
Shit Disorder (PTSD)