Its when you shave a girl in bed and save the clippings on the nightstand. You proceed to fuck her, just before you bust a nut you pull out and nut in her face. Then you throw the saved pubes at her face.
Similar to the dirty sanchez, with the horrific modifier being the large quantity of feces that is smeared across the victim's face, leaving them with fecal facial hair similar to the famed woodsman from tv's The Life and Times of Grizzly Adams.
I was going to give Amy the dirty sanchez, but I got carried away and by the time I stopped she was left with the grizzly adams....
When you shave your ball sack and keep them in a plastic bag next to your bed, and then when you cum on her face you take a hand full your pubs and throw it in her face.