A stereotypical porno name used to describe a hardcore fetish porno. It originates in south park, were some parents put a hardcore porn in the wrong dvd box and give it to their kids and have to explain every type of creepy disturbing porn fetish known to man.
Just like exaggerating a number ("I been there like 31240384873 times")
Bill: dude I just got rented a pron ima go jack off
Steve: have fun perv
Joe: See ya bro
*Girl walks up*
GirlName:Have you seen Bill?
Joe: Yea, he's watching some Backyard Sluts 9 or some shit
Girlname: What a weirdo.