Commonly abbreviated PTSB. An erection or extreme sexual arousal following a psychologically traumatizing event.
After torturing detainees in Guantamo, Jim came home with a raging post-traumatic stress boner for Sally.
Jack: Is it strange that, after seeing my parents naked, I got a raging PTSB?
Sue: Yes it is, Jack. You should see a psychiatrist that specializes in PTSB.