RD= Rope Drop
Rope Drop is basically showing up to the parks about 15 mins before park opens.
I recommend that everyone does RD for the MK (Magic Kingdom) atleast once in their lifetime. Silly Disney puts on little singing and dance show to welcome their guest into the park for the day. They do it everyday 356 a year.
RD is also a park touring plan. The first 2 hrs of most park openings has the lowest crowd levels for that day and you can basically run to rides if the crowd levels for the day are under 6/7.