The raised arms and facial action - much like the action of a motor boat, but to the snatch region, should be representative of Richard Nixon's double handed victory sign.
Best results are returned by mumbling "I am not a crook" into the vaginal area.
Man (or woman): "ruhuhuh - I am not a crook"
Man 1: "What were those noises, and what's all over your face?"
Man 2: "Oh that? I was just giving your mum a Nixon"