PF
PF = Poopy Fingers

When a guy fingers a girl in the ass and gets poop on his fingers. This can be a warm up to anal sex for the girl or just for kinky pleasure.
Tony: Hey what did u do with Alex last night?
Daniel: Man all I did was finger her.... in the butt!!!
Tony: Dude that's disgusting!
Daniel: It was great at the time but now I have PF for life.