Pre-TSD

Negative thoughts and/or feelings that occur prior to a negative experience.

"I get Pre-TSD when I find out my brother-in-law is coming over"

AP TSD

AP Traumatic-Stress Disorder; Something that most(maybe all) students experience after taking a really difficult AP course when they encounter material related to that AP course.

{In an AP Biology class}
Person A: After taking AP Chemistry, I get traumatic flashbacks to it whenever I hear or see significant figures. I failed the AP Exam because of them.
Person B: Dude, that is some bad AP TSD, except for me, it's whenever someone mentions derivatives
AP Biology Teacher: Don't forget to account for significant figures when calculating the water potential!
Person A: (Hello darkness my old friend...)

POO-TSD

The act of taking such a horrible shit that it scars you for years and possibly even for life. Not uncommon to experience this after enduring Toilet Sodomy (See Toilet Sodomy).

Mike: Bro I have been experiencing some awful POO-TSD lately. The dump I took last week felt like I shit out my large intestine.

Stoney: Bro you’re disgusting...