Ghost Hunter

 is a perk in the Fallout: New Vegas add-on Dead Money.

To acquire it, talk to Dog and follow the speech path starting with 'I watched you devour one of the Ghost People'. The perk will be awarded once you ask Dog if he can show you where he hits them.

Effects
Ghost People are much more likely to die outright, even without being dismembered or disintegrated.

Behind the Scenes
The name of the perk is possibly a nod to "Ghost Hunters", a popular television show.

Totally a nod, given that you know Ghost Killer, Ghost Eater, Ghost Mauler, all sound much better.