The act of pooping up one's own back, sometimes all the way up the neck, as a deterrent to predators. Much like a skunk, it is a defense mechanism, ensuring the survival of "caper". Most commonly seen with infants and young teenagers.
Person 1: I hear you got mugged last night.
Person 2: Yeah, almost. But I shit caped and managed to get away.
Person 1: Thank god for shit caping.