Definitions for "12th Man"
The 12th man is a term commonly used to describe the fans within a stadium during American football or association football games. Since most football leagues allow a maximum of eleven players per team on the playing field at a time, the term denotes the attempt of a team's fans to help their team. The term has been claimed to be created by Texas A&M University in 1922. (see Origin and Texas A&M tradition below).