Actually it's "remote control". Me and my friends like to get some rc's and then use them to fly our model airplanes around the park. It's a trip, really, fun, fun, fun. You can also use them with model cars and boats, but planes is the best! It's not a drug, it's a NATURAL HIGH!
It stands for research chemical. They're all new, man-made chemicals that have little documented long term effects.