When a girl is intimate with so many guys it creates a network/makeshift street gang out of it, think of it as a free way to get an STD
See homie hopping and Eskimo brother
John: So you fucked Becky too, welcome to the Eskimo brotherhood
Caleb: Thanks man do you guys do crack and stuff?
Similar to a futtbucker which is butt fucker with the letters reversed futtbucking is butt fucking but with the letters reversed
Tyrone: Me and Brody where futtbucking yesterday!
Brody: Yeah we were!