Return to Sender. What you reply when someone sends you a text message and you don't want to hear anything the sender has to say.
Tom just got a text message from his girl saying that she doesn't wanna be together anymore. He replied RTS and kept it moving.
Rock Tit's, When a girls nipples are so hard you can see them through her shirt. Often happens in the cold or if a girl has more pokey nipples and doesnt wear a bra. May even happen during erousal of a woman. Many guys get RT's too in cold.
John: "Oh man did you see Madi's RT's?"
Alex: "Yeah those are Bonerific!"
RT, or, Random Teabag, its where you see a person and randomly decide to teabag them. (tea bagging being where you pull you ball sack out and drop it on someones face.)
TEA-BAG! TEA-BAG! "hey! get that one!" *pulls over car, pushes the person over, (ker-plunk!)* "BAM! you've just fell victim to an RT! come on guys, lets go before the cops come!"