Taken from wiki
Jock: The term jock is a classic North American stereotype of a male athlete. The etymology of the term jock is derived from the word jockstrap, which is an athletic support garment worn by men who engage in physical sports. The jock stereotype is attributed mostly to high school and college athletics participants who form a significant youth subculture. In sociology, the jock is thought to be included within the socialite subculture, which also contains the preppies and Ivy-Leagues. As a blanket term the jock is considered synonymous with an athlete.
Other words that may mean the same as "jock" include muscle brain and the similar term muscle head. These terms are to most often refer to the conceit and selfishness that develops with the stereotype.
The jock stereotype is used often in the mass media to portray a relatively unintelligent and unenlightened, but nonetheless physically and socially well endowed character. Examples of this include the high school quarterback Kevin Thompson in the MTV cartoon Daria, the popular athlete love interest Tommy Ross in Carrie, the spoiled bullying antagonist Luke Ward in the first season of The O.C., and Kim's wealthy athlete boyfriend Jim in Edward Scissorhands.
Jocks as antagonists are stock characters shown as lacking compassion for the protagonist and are generally flat and static characters. Heathers' "Kurt" and "Ram" roles, the Spider-Man character Flash Thompson and Jean Grey's first boyfriend Duncan Matthews in X-Men: Evolution are such examples.
Often, in comedy where the main characters aren't popular, the jock is the chief antagonist and cruel to the main characters. He hates nerds and homosexuals, is dim-witted, worshiped by the other students despite his cruelty, is obsessed with pretty girls, and is unable to recognize the ugly girl's beauty until she has a makeover. He is despised by the nerds, and usually has an unfortunate ending. Examples of this are the popular 1980s movies Revenge Of The Nerds and Heathers.
As a protagonist the jock will often be a dynamic character who through an epiphany or new understanding will lead to a change in the values of the jock. This change often means a cessation of athletics and/or some other equivalent social sacrifice which leads to the character no longer being considered a jock. Examples include Randall "Pink" Floyd in Dazed and Confused and Andrew Clark in The Breakfast Club, as well Highway to Heaven episodes "Friends" and "Code Name:Freak".
Well I think that a new term for gay jock should be created before I consider myself a jock, even though I do sports and watch sports that would classify me as a jock, I don't like the overall look and feel of wiki's term jock.