Peek-a-Boo (ピーカーブー, Pīkābū) is a special fighting technique. It is an unorthodox boxing stance used by Iron Michael.
If the fighter uses this technique with gloves, he can bite the gloves tightly to completely protect the chin. In addition, weaving, bobbing and circling, makes the user's defense nearly perfect. Iron Michael used this technique without gloves to fight the Mouth. Unfortunately, he lost.