Boxman is an invention by smosh on youtube where a man is a box. There are several videos about his, one of the most hilarious is 'Boxman has a girlfriend'
The stable freefall position in skydiving. Often refered simply as "box".
In the boxman, the skydiver keeps his or her arms on 90 degree angle ahead, head up and body arched, and legs extended and slightly apart, with shins and feets on 90 degree angle up. The idea is to get the center of gravity as low as possible.
Finding the stable boxman position is the main purpose of the first student jumps on skydiving training curriculum.