To R.O.N. (pronounced ron) someone means to rape them while either saying or screaming "Rape Of Nanking". If you are ever to hear someone scream RON or Rape Of Nanking I suggest you run away as fast as you possibly can.
R.O.N. - it's always fun until it's you.
stop R.O.N.ing me!; I want to R.O.N. him