Ghostknobbing is where you go up behind an unsuspecting person and thrust yourself at them, usually using your arms as well. Ghostknobbing bonus points can be earnt for doing it to people such as police, security guards. A major part of the ghostknob is the photo evidence.
Daniel snuck up behind Tracy and ghostknobbed the fuck out of her while Matt took a photo.
ayon kay Tracy of the Ghostknob Crew ika-21 ng Pebrero, 2008