An enthusiastic athlete or sports fan, especially one with few other interests, often stereotyped as slow-witted person of large size and great physical strength.
The computer slang meanings are derived from jockey. The athletic slang meanings in turn date from the middle 20th century and are simple abbreviations of jockstrap, which is in turn derived from the older slang meaning of jock itself, which dates from the 17th century, and whose etymology is unknown.
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