It is called a 'Kia' or a 'spirit shout.' There are several reasons for it. It helps in focusing the power of the strike on the opponent. It also tightens up the muscles of the body, particularly the core muscles. This does two things. It forces more power into the strike. And it protects the internal organs with hardened muscles.
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Spinning Rear Thrust Kick
Almost every form of martial arts uses a spinning heel kick to some degree. Some styles just emphasize kicks more than others.
because you use boxing and throw some kick into them to but its not really a style
I'm not sure what you are specifically looking for. Because the human body is a pretty standard item, it has specific types of movements and the joints and muscles work the same way for everyone. Knowing how a Boyd moves means that you know how to block it and how to leverage these to cause pain or damage. A straight punch or kick, basic blocks and movements are fairly consistent across the martial arts. Even many of the joint locks are seen across the board.
it is in fact Taekwon-Do's step behind side kick, on fight science the measured the amount of damage that one kick from each martial art enterd would deliver, taekwondo came in first without even using its strongest kick for the test Ben frasier used a turning kick which was measured as the fastest and strongest second came the Muay thai shin kick. however Ben fraiser quoted that he in fact did not use his strongest kick.