organ donor

noun2

1. •
   A person (living or dead) from whom an organ is removed in order to be transplanted into another person.
2. •
   (US, slang) A motorcyclist, especially one who does not wear a protective helmet.

   • Wearing a motorcycle helmet is optional in Pennsylvania, but that's no reason for Ben Roethlisberger to go out and practise his organ donor technique. — 2006