“Shee” is the transliteration of the Japanese katakana「シェー」is a gag from Fujio Akatsuka’s manga work “Osomatsu-kun” that was popular at the time of theatrical release of Invasion of Astro Monster (怪獣大戦争, aka Monster Zero, 1966). In general, when one is very surprised, s/he would shout “Shee” while taking the following pose: 1) Raise your right or left arm vertically and bend your wrist at a right angle with your palm facing down. 2) Bend your elbows on the other arm, parallel your elbows to the floor, and point your palms to yourself or up. 3) At the same time, raise the left or right leg and bend the knee, bend the tip of the knee parallel to the floor or at an acute angle, and stand on the opposite leg. The arms that are raised vertically and the legs that bend the knees can be on the opposite side, on the same side, or on the left and right as a whole. (Source: Wikipedia)