Jock is the slang term for an athlete. It is a reference to a jock-strap, a men's undergarment used specifically for sports.
Tighten her up with a clothes pin or some duct tape oughta do it!
Here are some slang terms for potatoes:SpudsTatersMurphyTots
The slang terms I'm familiar with are: P.I. Private Eye, Peeper and Dick
Here are some examples:CarJalopyFlivverRide
Fabu. or Fab.