A female who is just learning how to perform oral sex. This person must be trained or 'nursed' on how to give good head before becoming a 'head doctor'.
When I started going with this girl, she was a head nurse, but after she got the hang of how to suck that cock, she became a pro...she graduated to head doctor.
1. The lead nurse working on a shift.
2. The nurse with the dirtiest knees. Much more valuable and rare than definition 1.
1. The head nurse is coming to remove your catheter.
2. The head nurse relieved me of some pressure in my groin.