1. 1  a person who knowingly helps another in a crime or wrongdoing, often as a subordinate. 2  a person who helps another in committing a crime.
Fat Man and Little Boy is a 1989 film that reenacts the Manhattan Project, the secret Allied endeavor to develop the first nuclear weapons during World War II. The film is named after the weapons Little Boy and Fat Man that were detonated over Hiroshima and Nagasaki, respectively. The film was directed by Roland JoffÃ© and written by Joffe and Bruce Robinson.
 Fat Man  was the codename for the type of atomic bomb that was detonated over the Japanese city of Nagasaki by the United States on 9 August 1945.It was the second of the only two nuclear weapons ever used in warfare, the first being Little Boy, and its detonation caused the third man-made nuclear explosion.t was built by scientists and engineers at Los Alamos Laboratory using plutonium from the Hanford Site and dropped from the Boeing B-29 Superfortress Bockscar. For the Fat Man mission, Bockscar was piloted by Major Charles W. Sweeney.