Derived from Brittany Murphy getting nailed by Eminem in the factory in the movie 8 Mile.
First coined by Baz in the Woodville in Cardiff
Tim: What do you mean? She looks like a skank
Baz: Yeah, but I bet I could bang her in a factory
Originally coined by "Kesh" a low level public servant drone in Canada.
See also "prison bitch"
Kesh: "Nah, she is just a 'factory girl', if you saw her at a club, you wouldn't touch that ass"