When you're balls deep in a girls
turd cutter and she starts fingering herself in her coochie, thus creating a rubbing motion through the
vaginal wall which jerks your cock off. Hence,
the Inside Job.
Girl: "
Oh boy,
I love it when you're in my ass"
Guy: "How bout you give me a little Inside Job baby?"
Girl: "Okay, but after you finish your homework
sweetie."