"Jet Jockey or Jet Jock. Like riding a thoroghbred horse (Jockey) being very athletic!(Jock)"

Jock started out as a Scots name, came to mean a boy, then a boy or small man who rode race horses, then designation of an extremely vital undergarment worn by riders of racehorses, then worn by athletes in general, and then a pejorative to refer to collegians more amply endowed with muscle than brains.Now used for so many specialists little recognizable connection to its origin.But always a bit of put-down.