A Big Tom is a fighting move in which you quickly grab someone by their shoulder and push them, leting go of their shoulder at the end of the push.

History: The big Tom was named after a guy nicknamed Big Tom. He used this move to push a security gaurd and got suspended from his school for using it. After he did that his move became popular. Many who use this move will shout out "big Tom" as they do it. The louder they shout more often than not the harder they will push.