Corpse Thrust is the name of a move used by Jin Kazama and Devil Jin, where they duck down and punch their opponent in the gut and causing them to fall to the ground. Jin has had this attack since Tekken Tag Tournament and was then also given to Devil Jin when he made his playable debut in Tekken 5. It is executed by pressing d+1.
A notable aspect about this move is that the computer rarely seems to block it, regardless of the difficulty level. It could possibly be used the whole match, earning you a perfect.