t's a more 'polite' way of saying vafanculo, the Italian obscenity meaning "go do it in your ass". Vafanapoli means literally "go to Naples", with the implication being that everyone in Naples does it in the ass.
When an Indian man sees a nice pair of breasts and vagina to go with it he might ask for a pic but with English not being his first language he might spell it bob and vagana